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21232908 = 223347289
BaseRepresentation
bin101000011111…
…1110100001100
31110221202002000
41100333310030
520413423113
62035032300
7345322344
oct120776414
943852060
1021232908
1110a92664
12713b690
134525668
142b69d24
151ce6373
hex143fd0c

21232908 has 72 divisors (see below), whose sum is σ = 56876400. Its totient is φ = 6849216.

The previous prime is 21232879. The next prime is 21232919. The reversal of 21232908 is 80923212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238528 + ... + 238616.

It is an arithmetic number, because the mean of its divisors is an integer number (789950).

Almost surely, 221232908 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28438200).

21232908 is an abundant number, since it is smaller than the sum of its proper divisors (35643492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232908 is a wasteful number, since it uses less digits than its factorization.

21232908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21232908 is about 4607.9179680198. The cubic root of 21232908 is about 276.9086310840.

The spelling of 21232908 in words is "twenty-one million, two hundred thirty-two thousand, nine hundred eight".

Divisors: 1 2 3 4 6 9 12 18 27 36 47 54 89 94 108 141 178 188 267 282 356 423 534 564 801 846 1068 1269 1602 1692 2209 2403 2538 3204 4183 4418 4806 5076 6627 8366 8836 9612 12549 13254 16732 19881 25098 26508 37647 39762 50196 59643 75294 79524 112941 119286 150588 196601 225882 238572 393202 451764 589803 786404 1179606 1769409 2359212 3538818 5308227 7077636 10616454 21232908