21053272 has 16 divisors (see below), whose sum is σ = 39778200. Its totient is φ = 10445760.

The previous prime is 21053269. The next prime is 21053281. The reversal of 21053272 is 27235012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8997 + ... + 11092.

Almost surely, 2^21053272 is an apocalyptic number.

It is an amenable number.

21053272 is a deficient number, since it is larger than the sum of its proper divisors (18724928).

21053272 is a wasteful number, since it uses less digits than its factorization.

21053272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20226 (or 20222 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21053272 is about 4588.3844651467. The cubic root of 21053272 is about 276.1255117726.

Adding to 21053272 its reverse (27235012), we get a palindrome (48288284).

The spelling of 21053272 in words is "twenty-one million, fifty-three thousand, two hundred seventy-two".