21456276 has 12 divisors (see below), whose sum is σ = 50064672. Its totient is φ = 7152088.

The previous prime is 21456257. The next prime is 21456287. The reversal of 21456276 is 67265412.

It is a tau number, because it is divible by the number of its divisors (12).

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, 894000 + ... + 894023.

It is an arithmetic number, because the mean of its divisors is an integer number (4172056).

Almost surely, 2^21456276 is an apocalyptic number.

It is an amenable number.

21456276 is an abundant number, since it is smaller than the sum of its proper divisors (28608396).

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

21456276 is a wasteful number, since it uses less digits than its factorization.

21456276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788030 (or 1788028 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 21456276 is about 4632.0919679989. The cubic root of 21456276 is about 277.8762625837.

The spelling of 21456276 in words is "twenty-one million, four hundred fifty-six thousand, two hundred seventy-six".