21371532 has 48 divisors (see below), whose sum is σ = 61377792. Its totient is φ = 5636160.

The previous prime is 21371509. The next prime is 21371551. The reversal of 21371532 is 23517312.

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, 8694 + ... + 10877.

It is an arithmetic number, because the mean of its divisors is an integer number (1278704).

Almost surely, 2^21371532 is an apocalyptic number.

It is an amenable number.

21371532 is an abundant number, since it is smaller than the sum of its proper divisors (40006260).

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

21371532 is a wasteful number, since it uses less digits than its factorization.

21371532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19598 (or 19596 counting only the distinct ones).

The product of its digits is 1260, while the sum is 24.

The square root of 21371532 is about 4622.9354310870. The cubic root of 21371532 is about 277.5099452649.

Adding to 21371532 its reverse (23517312), we get a palindrome (44888844).

The spelling of 21371532 in words is "twenty-one million, three hundred seventy-one thousand, five hundred thirty-two".