21291162 has 16 divisors (see below), whose sum is σ = 44051040. Its totient is φ = 6852272.

The previous prime is 21291161. The next prime is 21291197. The reversal of 21291162 is 26119212.

It is not an unprimeable number, because it can be changed into a prime (21291161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61008 + ... + 61355.

It is an arithmetic number, because the mean of its divisors is an integer number (2753190).

Almost surely, 2^21291162 is an apocalyptic number.

21291162 is an abundant number, since it is smaller than the sum of its proper divisors (22759878).

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

21291162 is a wasteful number, since it uses less digits than its factorization.

21291162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122397.

The product of its digits is 432, while the sum is 24.

The square root of 21291162 is about 4614.2347144462. The cubic root of 21291162 is about 277.1616393802.

The spelling of 21291162 in words is "twenty-one million, two hundred ninety-one thousand, one hundred sixty-two".