21376272 has 20 divisors (see below), whose sum is σ = 55222160. Its totient is φ = 7125408.

The previous prime is 21376253. The next prime is 21376279. The reversal of 21376272 is 27267312.

It is not an unprimeable number, because it can be changed into a prime (21376279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222622 + ... + 222717.

It is an arithmetic number, because the mean of its divisors is an integer number (2761108).

Almost surely, 2^21376272 is an apocalyptic number.

It is an amenable number.

21376272 is an abundant number, since it is smaller than the sum of its proper divisors (33845888).

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

21376272 is a wasteful number, since it uses less digits than its factorization.

21376272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445350 (or 445344 counting only the distinct ones).

The product of its digits is 7056, while the sum is 30.

The square root of 21376272 is about 4623.4480639453. The cubic root of 21376272 is about 277.5304600928.

The spelling of 21376272 in words is "twenty-one million, three hundred seventy-six thousand, two hundred seventy-two".