21402896 has 20 divisors (see below), whose sum is σ = 42806784. Its totient is φ = 10356000.

The previous prime is 21402893. The next prime is 21402919. The reversal of 21402896 is 69820412.

21402896 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21402893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21080 + ... + 22071.

Almost surely, 2^21402896 is an apocalyptic number.

It is an amenable number.

21402896 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21402896 is a wasteful number, since it uses less digits than its factorization.

21402896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43190 (or 43184 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 21402896 is about 4626.3264043947. The cubic root of 21402896 is about 277.6456330511.

The spelling of 21402896 in words is "twenty-one million, four hundred two thousand, eight hundred ninety-six".