21125132 has 24 divisors (see below), whose sum is σ = 44088576. Its totient is φ = 8659728.

The previous prime is 21125123. The next prime is 21125161. The reversal of 21125132 is 23152112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21125132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15758 + ... + 17045.

It is an arithmetic number, because the mean of its divisors is an integer number (1837024).

Almost surely, 2^21125132 is an apocalyptic number.

It is an amenable number.

21125132 is an abundant number, since it is smaller than the sum of its proper divisors (22963444).

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

21125132 is a wasteful number, since it uses less digits than its factorization.

21125132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32837 (or 32835 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 21125132 is about 4596.2084373971. The cubic root of 21125132 is about 276.4393164605.

Adding to 21125132 its reverse (23152112), we get a palindrome (44277244).

The spelling of 21125132 in words is "twenty-one million, one hundred twenty-five thousand, one hundred thirty-two".