21275336 has 16 divisors (see below), whose sum is σ = 40546140. Its totient is φ = 10463040.

The previous prime is 21275329. The next prime is 21275369. The reversal of 21275336 is 63357212.

It can be written as a sum of positive squares in 2 ways, for example, as 13468900 + 7806436 = 3670^2 + 2794^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21275299 and 21275308.

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, 21311 + ... + 22286.

Almost surely, 2^21275336 is an apocalyptic number.

It is an amenable number.

21275336 is a deficient number, since it is larger than the sum of its proper divisors (19270804).

21275336 is a wasteful number, since it uses less digits than its factorization.

21275336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43664 (or 43660 counting only the distinct ones).

The product of its digits is 7560, while the sum is 29.

The square root of 21275336 is about 4612.5194850537. The cubic root of 21275336 is about 277.0929497306.

The spelling of 21275336 in words is "twenty-one million, two hundred seventy-five thousand, three hundred thirty-six".