21672264 has 32 divisors (see below), whose sum is σ = 55336320. Its totient is φ = 7070016.

The previous prime is 21672239. The next prime is 21672271. The reversal of 21672264 is 46227612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8479 + ... + 10734.

It is an arithmetic number, because the mean of its divisors is an integer number (1729260).

Almost surely, 2^21672264 is an apocalyptic number.

21672264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21672264 is an abundant number, since it is smaller than the sum of its proper divisors (33664056).

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

21672264 is a wasteful number, since it uses less digits than its factorization.

21672264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19269 (or 19265 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 21672264 is about 4655.3478924781. The cubic root of 21672264 is about 278.8055581779.

Adding to 21672264 its reverse (46227612), we get a palindrome (67899876).

The spelling of 21672264 in words is "twenty-one million, six hundred seventy-two thousand, two hundred sixty-four".