21478896 has 30 divisors (see below), whose sum is σ = 60111480. Its totient is φ = 7159584.

The previous prime is 21478883. The next prime is 21478901. The reversal of 21478896 is 69887412.

It is a super-2 number, since 2×21478896² = 922685946757632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74436 + ... + 74723.

It is an arithmetic number, because the mean of its divisors is an integer number (2003716).

Almost surely, 2^21478896 is an apocalyptic number.

It is an amenable number.

21478896 is an abundant number, since it is smaller than the sum of its proper divisors (38632584).

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

21478896 is a wasteful number, since it uses less digits than its factorization.

21478896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149173 (or 149164 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 21478896 is about 4634.5329861810. The cubic root of 21478896 is about 277.9738774343.

The spelling of 21478896 in words is "twenty-one million, four hundred seventy-eight thousand, eight hundred ninety-six".