21973896 has 64 divisors (see below), whose sum is σ = 69763200. Its totient is φ = 6277824.

The previous prime is 21973883. The next prime is 21973907. The reversal of 21973896 is 69837912.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5755 + ... + 8778.

It is an arithmetic number, because the mean of its divisors is an integer number (1090050).

Almost surely, 2^21973896 is an apocalyptic number.

It is an amenable number.

21973896 is an abundant number, since it is smaller than the sum of its proper divisors (47789304).

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

21973896 is a wasteful number, since it uses less digits than its factorization.

21973896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14555 (or 14545 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 21973896 is about 4687.6322381347. The cubic root of 21973896 is about 280.0930643027.

The spelling of 21973896 in words is "twenty-one million, nine hundred seventy-three thousand, eight hundred ninety-six".