21716912 has 40 divisors (see below), whose sum is σ = 48782592. Its totient is φ = 9172800.

The previous prime is 21716887. The next prime is 21716927. The reversal of 21716912 is 21961712.

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, 6587 + ... + 9317.

Almost surely, 2^21716912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21716912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24391296).

21716912 is an abundant number, since it is smaller than the sum of its proper divisors (27065680).

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

21716912 is a wasteful number, since it uses less digits than its factorization.

21716912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817 (or 2811 counting only the distinct ones).

The product of its digits is 1512, while the sum is 29.

The square root of 21716912 is about 4660.1407704060. The cubic root of 21716912 is about 278.9968867815.

The spelling of 21716912 in words is "twenty-one million, seven hundred sixteen thousand, nine hundred twelve".