21276396 has 36 divisors (see below), whose sum is σ = 54056184. Its totient is φ = 7056000.

The previous prime is 21276389. The next prime is 21276407. The reversal of 21276396 is 69367212.

21276396 is a `hidden beast` number, since 2 + 12 + 7 + 639 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21276396.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6196 + ... + 8996.

Almost surely, 2^21276396 is an apocalyptic number.

It is an amenable number.

21276396 is an abundant number, since it is smaller than the sum of its proper divisors (32779788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21276396 is a wasteful number, since it uses less digits than its factorization.

21276396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3022 (or 3017 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 21276396 is about 4612.6343882862. The cubic root of 21276396 is about 277.0975515169.

The spelling of 21276396 in words is "twenty-one million, two hundred seventy-six thousand, three hundred ninety-six".