21936912 has 40 divisors (see below), whose sum is σ = 57746304. Its totient is φ = 7173504.

The previous prime is 21936911. The next prime is 21936913. The reversal of 21936912 is 21963912.

It is an interprime number because it is at equal distance from previous prime (21936911) and next prime (21936913).

It is not an unprimeable number, because it can be changed into a prime (21936911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1768 + ... + 6855.

Almost surely, 2^21936912 is an apocalyptic number.

It is an amenable number.

21936912 is an abundant number, since it is smaller than the sum of its proper divisors (35809392).

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

21936912 is a wasteful number, since it uses less digits than its factorization.

21936912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8687 (or 8681 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 21936912 is about 4683.6857281419. The cubic root of 21936912 is about 279.9358356375.

Subtracting 21936912 from its reverse (21963912), we obtain a cube (27000 = 30³).

The spelling of 21936912 in words is "twenty-one million, nine hundred thirty-six thousand, nine hundred twelve".