21727396 has 12 divisors (see below), whose sum is σ = 38223360. Its totient is φ = 10806440.

The previous prime is 21727369. The next prime is 21727397. The reversal of 21727396 is 69372712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21727397) 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, 13456 + ... + 14983.

It is an arithmetic number, because the mean of its divisors is an integer number (3185280).

Almost surely, 2^21727396 is an apocalyptic number.

It is an amenable number.

21727396 is a deficient number, since it is larger than the sum of its proper divisors (16495964).

21727396 is a wasteful number, since it uses less digits than its factorization.

21727396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28634 (or 28632 counting only the distinct ones).

The product of its digits is 31752, while the sum is 37.

The square root of 21727396 is about 4661.2654934041. The cubic root of 21727396 is about 279.0417754962.

The spelling of 21727396 in words is "twenty-one million, seven hundred twenty-seven thousand, three hundred ninety-six".