21052926 has 64 divisors (see below), whose sum is σ = 49412160. Its totient is φ = 6635520.

The previous prime is 21052909. The next prime is 21052943. The reversal of 21052926 is 62925012.

It is an interprime number because it is at equal distance from previous prime (21052909) and next prime (21052943).

It is a super-2 number, since 2×21052926² = 886451386322952, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21052926.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81790 + ... + 82046.

It is an arithmetic number, because the mean of its divisors is an integer number (772065).

Almost surely, 2^21052926 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21052926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24706080).

21052926 is an abundant number, since it is smaller than the sum of its proper divisors (28359234).

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

21052926 is a wasteful number, since it uses less digits than its factorization.

21052926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21052926 is about 4588.3467610894. The cubic root of 21052926 is about 276.1239991027.

Adding to 21052926 its reverse (62925012), we get a palindrome (83977938).

The spelling of 21052926 in words is "twenty-one million, fifty-two thousand, nine hundred twenty-six".