21917112 has 48 divisors (see below), whose sum is σ = 63741960. Its totient is φ = 6261696.

The previous prime is 21917023. The next prime is 21917113. The reversal of 21917112 is 21171912.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21917113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8143 + ... + 10494.

Almost surely, 2^21917112 is an apocalyptic number.

It is an amenable number.

21917112 is an abundant number, since it is smaller than the sum of its proper divisors (41824848).

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

21917112 is a wasteful number, since it uses less digits than its factorization.

21917112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18660 (or 18649 counting only the distinct ones).

The product of its digits is 252, while the sum is 24.

The square root of 21917112 is about 4681.5715310139. The cubic root of 21917112 is about 279.8515880159.

The spelling of 21917112 in words is "twenty-one million, nine hundred seventeen thousand, one hundred twelve".