21274312 has 8 divisors (see below), whose sum is σ = 39889350. Its totient is φ = 10637152.

The previous prime is 21274307. The next prime is 21274343. The reversal of 21274312 is 21347212.

It can be written as a sum of positive squares in only one way, i.e., 20921476 + 352836 = 4574^2 + 594^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1329637 + ... + 1329652.

Almost surely, 2^21274312 is an apocalyptic number.

It is an amenable number.

21274312 is a deficient number, since it is larger than the sum of its proper divisors (18615038).

21274312 is a wasteful number, since it uses less digits than its factorization.

21274312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659295 (or 2659291 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The square root of 21274312 is about 4612.4084814769. The cubic root of 21274312 is about 277.0885040863.

Subtracting 21274312 from its reverse (21347212), we obtain a square (72900 = 270²).

The spelling of 21274312 in words is "twenty-one million, two hundred seventy-four thousand, three hundred twelve".