21273412 has 12 divisors (see below), whose sum is σ = 37261756. Its totient is φ = 10627200.

The previous prime is 21273391. The next prime is 21273431. The reversal of 21273412 is 21437212.

It can be written as a sum of positive squares in 2 ways, for example, as 9821956 + 11451456 = 3134^2 + 3384^2 .

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, 5728 + ... + 8680.

Almost surely, 2^21273412 is an apocalyptic number.

It is an amenable number.

21273412 is a deficient number, since it is larger than the sum of its proper divisors (15988344).

21273412 is a wasteful number, since it uses less digits than its factorization.

21273412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4758 (or 4756 counting only the distinct ones).

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

The square root of 21273412 is about 4612.3109175336. The cubic root of 21273412 is about 277.0845966639.

The spelling of 21273412 in words is "twenty-one million, two hundred seventy-three thousand, four hundred twelve".