21723162 has 16 divisors (see below), whose sum is σ = 43735872. Its totient is φ = 7192800.

The previous prime is 21723113. The next prime is 21723167. The reversal of 21723162 is 26132712.

It is not an unprimeable number, because it can be changed into a prime (21723167) 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, 11083 + ... + 12894.

It is an arithmetic number, because the mean of its divisors is an integer number (2733492).

Almost surely, 2^21723162 is an apocalyptic number.

21723162 is an abundant number, since it is smaller than the sum of its proper divisors (22012710).

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

21723162 is a wasteful number, since it uses less digits than its factorization.

21723162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24133.

The product of its digits is 1008, while the sum is 24.

The square root of 21723162 is about 4660.8113027669. The cubic root of 21723162 is about 279.0236487707.

Adding to 21723162 its reverse (26132712), we get a palindrome (47855874).

The spelling of 21723162 in words is "twenty-one million, seven hundred twenty-three thousand, one hundred sixty-two".