Search a number
-
+
21552345 = 335179391
BaseRepresentation
bin101001000110…
…1110011011001
31111112222021000
41102031303121
521004133340
62045535213
7351122553
oct122156331
944488230
1021552345
1111190661
127274509
134607b89
142c104d3
151d5ad30
hex148dcd9

21552345 has 32 divisors (see below), whose sum is σ = 40573440. Its totient is φ = 10817280.

The previous prime is 21552341. The next prime is 21552353. The reversal of 21552345 is 54325512.

It is a happy number.

It is not a de Polignac number, because 21552345 - 22 = 21552341 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (21552341) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2401 + ... + 6990.

It is an arithmetic number, because the mean of its divisors is an integer number (1267920).

Almost surely, 221552345 is an apocalyptic number.

It is an amenable number.

21552345 is a deficient number, since it is larger than the sum of its proper divisors (19021095).

21552345 is a wasteful number, since it uses less digits than its factorization.

21552345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9422 (or 9416 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 21552345 is about 4642.4503228360. The cubic root of 21552345 is about 278.2903691038.

Adding to 21552345 its reverse (54325512), we get a palindrome (75877857).

The spelling of 21552345 in words is "twenty-one million, five hundred fifty-two thousand, three hundred forty-five".

Divisors: 1 3 5 9 15 17 27 45 51 85 135 153 255 459 765 2295 9391 28173 46955 84519 140865 159647 253557 422595 478941 798235 1267785 1436823 2394705 4310469 7184115 21552345