21468516 has 24 divisors (see below), whose sum is σ = 50433600. Its totient is φ = 7107552.

The previous prime is 21468511. The next prime is 21468527. The reversal of 21468516 is 61586412.

It is not an unprimeable number, because it can be changed into a prime (21468511) 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, 4216 + ... + 7791.

It is an arithmetic number, because the mean of its divisors is an integer number (2101400).

Almost surely, 2^21468516 is an apocalyptic number.

It is an amenable number.

21468516 is an abundant number, since it is smaller than the sum of its proper divisors (28965084).

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

21468516 is a wasteful number, since it uses less digits than its factorization.

21468516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12163 (or 12161 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 21468516 is about 4633.4129969171. The cubic root of 21468516 is about 277.9290918648.

The spelling of 21468516 in words is "twenty-one million, four hundred sixty-eight thousand, five hundred sixteen".