21117936 has 40 divisors (see below), whose sum is σ = 62349184. Its totient is φ = 6033600.

The previous prime is 21117881. The next prime is 21117953. The reversal of 21117936 is 63971112.

It is a congruent number.

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, 31090 + ... + 31761.

Almost surely, 2^21117936 is an apocalyptic number.

It is an amenable number.

21117936 is an abundant number, since it is smaller than the sum of its proper divisors (41231248).

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

21117936 is a wasteful number, since it uses less digits than its factorization.

21117936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62869 (or 62863 counting only the distinct ones).

The product of its digits is 2268, while the sum is 30.

The square root of 21117936 is about 4595.4255515676. The cubic root of 21117936 is about 276.4079244162.

The spelling of 21117936 in words is "twenty-one million, one hundred seventeen thousand, nine hundred thirty-six".