21162572 has 12 divisors (see below), whose sum is σ = 37117080. Its totient is φ = 10557696.

The previous prime is 21162551. The next prime is 21162613. The reversal of 21162572 is 27526112.

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, 3797 + ... + 7532.

It is an arithmetic number, because the mean of its divisors is an integer number (3093090).

Almost surely, 2^21162572 is an apocalyptic number.

It is an amenable number.

21162572 is a deficient number, since it is larger than the sum of its proper divisors (15954508).

21162572 is a wasteful number, since it uses less digits than its factorization.

21162572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11800 (or 11798 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 21162572 is about 4600.2795567226. The cubic root of 21162572 is about 276.6025308988.

Adding to 21162572 its reverse (27526112), we get a palindrome (48688684).

The spelling of 21162572 in words is "twenty-one million, one hundred sixty-two thousand, five hundred seventy-two".