21499456 has 28 divisors (see below), whose sum is σ = 46542960. Its totient is φ = 9772160.

The previous prime is 21499453. The next prime is 21499459. The reversal of 21499456 is 65499412.

It is an interprime number because it is at equal distance from previous prime (21499453) and next prime (21499459).

It is not an unprimeable number, because it can be changed into a prime (21499451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14566 + ... + 15973.

Almost surely, 2^21499456 is an apocalyptic number.

It is an amenable number.

21499456 is an abundant number, since it is smaller than the sum of its proper divisors (25043504).

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

21499456 is a wasteful number, since it uses less digits than its factorization.

21499456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30562 (or 30552 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 21499456 is about 4636.7505863482. The cubic root of 21499456 is about 278.0625430768.

The spelling of 21499456 in words is "twenty-one million, four hundred ninety-nine thousand, four hundred fifty-six".