21492456 has 32 divisors (see below), whose sum is σ = 53924640. Its totient is φ = 7138368.

The previous prime is 21492433. The next prime is 21492463. The reversal of 21492456 is 65429412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5910 + ... + 8826.

It is an arithmetic number, because the mean of its divisors is an integer number (1685145).

Almost surely, 2^21492456 is an apocalyptic number.

It is an amenable number.

21492456 is an abundant number, since it is smaller than the sum of its proper divisors (32432184).

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

21492456 is a wasteful number, since it uses less digits than its factorization.

21492456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233 (or 3229 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 21492456 is about 4635.9956859341. The cubic root of 21492456 is about 278.0323617072.

The spelling of 21492456 in words is "twenty-one million, four hundred ninety-two thousand, four hundred fifty-six".