21537162 has 12 divisors (see below), whose sum is σ = 46663890. Its totient is φ = 7179048.

The previous prime is 21537161. The next prime is 21537163. The reversal of 21537162 is 26173512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21537161) and next prime (21537163).

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 2692881 = 4341^2 + 1641^2 .

It is not an unprimeable number, because it can be changed into a prime (21537161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 598237 + ... + 598272.

Almost surely, 2^21537162 is an apocalyptic number.

21537162 is an abundant number, since it is smaller than the sum of its proper divisors (25126728).

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

21537162 is a wasteful number, since it uses less digits than its factorization.

21537162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196517 (or 1196514 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 21537162 is about 4640.8147991490. The cubic root of 21537162 is about 278.2250045962.

The spelling of 21537162 in words is "twenty-one million, five hundred thirty-seven thousand, one hundred sixty-two".