21157162 has 16 divisors (see below), whose sum is σ = 34253352. Its totient is φ = 9743040.

The previous prime is 21157139. The next prime is 21157207. The reversal of 21157162 is 26175112.

It can be written as a sum of positive squares in 4 ways, for example, as 15295921 + 5861241 = 3911^2 + 2421^2 .

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 7 ways as a sum of consecutive naturals, for example, 20212 + ... + 21232.

Almost surely, 2^21157162 is an apocalyptic number.

21157162 is a deficient number, since it is larger than the sum of its proper divisors (13096190).

21157162 is a wasteful number, since it uses less digits than its factorization.

21157162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833.

The product of its digits is 840, while the sum is 25.

The square root of 21157162 is about 4599.6915113951. The cubic root of 21157162 is about 276.5789586660.

The spelling of 21157162 in words is "twenty-one million, one hundred fifty-seven thousand, one hundred sixty-two".