21052572 has 12 divisors (see below), whose sum is σ = 49122696. Its totient is φ = 7017520.

The previous prime is 21052561. The next prime is 21052583. The reversal of 21052572 is 27525012.

It is an interprime number because it is at equal distance from previous prime (21052561) and next prime (21052583).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 877179 + ... + 877202.

It is an arithmetic number, because the mean of its divisors is an integer number (4093558).

Almost surely, 2^21052572 is an apocalyptic number.

It is an amenable number.

21052572 is an abundant number, since it is smaller than the sum of its proper divisors (28070124).

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

21052572 is a wasteful number, since it uses less digits than its factorization.

21052572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754388 (or 1754386 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 21052572 is about 4588.3081849414. The cubic root of 21052572 is about 276.1224514407.

Adding to 21052572 its reverse (27525012), we get a palindrome (48577584).

The spelling of 21052572 in words is "twenty-one million, fifty-two thousand, five hundred seventy-two".