21716634 has 32 divisors (see below), whose sum is σ = 45549504. Its totient is φ = 6894720.

The previous prime is 21716627. The next prime is 21716659. The reversal of 21716634 is 43661712.

It is a super-2 number, since 2×21716634² = 943224384579912, which contains 22 as substring.

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, 9552 + ... + 11604.

It is an arithmetic number, because the mean of its divisors is an integer number (1423422).

Almost surely, 2^21716634 is an apocalyptic number.

21716634 is an abundant number, since it is smaller than the sum of its proper divisors (23832870).

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

21716634 is a wasteful number, since it uses less digits than its factorization.

21716634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142.

The product of its digits is 6048, while the sum is 30.

The square root of 21716634 is about 4660.1109428854. The cubic root of 21716634 is about 278.9956962890.

The spelling of 21716634 in words is "twenty-one million, seven hundred sixteen thousand, six hundred thirty-four".