Search a number
-
+
21052812 = 22311159491
BaseRepresentation
bin101000001001…
…1110110001100
31110121121000210
41100103312030
520342142222
62031122420
7343642314
oct120236614
943547023
1021052812
111097a320
127073410
1344916b1
142b20444
151cacd0c
hex1413d8c

21052812 has 24 divisors (see below), whose sum is σ = 53589312. Its totient is φ = 6379600.

The previous prime is 21052771. The next prime is 21052841. The reversal of 21052812 is 21825012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79614 + ... + 79877.

It is an arithmetic number, because the mean of its divisors is an integer number (2232888).

Almost surely, 221052812 is an apocalyptic number.

21052812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21052812 is an abundant number, since it is smaller than the sum of its proper divisors (32536500).

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

21052812 is a wasteful number, since it uses less digits than its factorization.

21052812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159509 (or 159507 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21052812 is about 4588.3343382975. The cubic root of 21052812 is about 276.1235007050.

Adding to 21052812 its reverse (21825012), we get a palindrome (42877824).

The spelling of 21052812 in words is "twenty-one million, fifty-two thousand, eight hundred twelve".

Divisors: 1 2 3 4 6 11 12 22 33 44 66 132 159491 318982 478473 637964 956946 1754401 1913892 3508802 5263203 7017604 10526406 21052812