21325572 has 48 divisors (see below), whose sum is σ = 55540800. Its totient is φ = 7076160.

The previous prime is 21325567. The next prime is 21325583. The reversal of 21325572 is 27552312.

It is a super-2 number, since 2×21325572² = 909560042254368, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40672 + ... + 41192.

It is an arithmetic number, because the mean of its divisors is an integer number (1157100).

Almost surely, 2^21325572 is an apocalyptic number.

It is an amenable number.

21325572 is an abundant number, since it is smaller than the sum of its proper divisors (34215228).

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

21325572 is a wasteful number, since it uses less digits than its factorization.

21325572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 905 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 21325572 is about 4617.9618881061. The cubic root of 21325572 is about 277.3108718608.

Adding to 21325572 its reverse (27552312), we get a palindrome (48877884).

The spelling of 21325572 in words is "twenty-one million, three hundred twenty-five thousand, five hundred seventy-two".