21465912 has 64 divisors (see below), whose sum is σ = 58423680. Its totient is φ = 6532992.

The previous prime is 21465907. The next prime is 21465937. The reversal of 21465912 is 21956412.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21465912.

It is a congruent number.

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, 33063 + ... + 33705.

It is an arithmetic number, because the mean of its divisors is an integer number (912870).

Almost surely, 2^21465912 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 21465912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29211840).

21465912 is an abundant number, since it is smaller than the sum of its proper divisors (36957768).

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

21465912 is a wasteful number, since it uses less digits than its factorization.

21465912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 768 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 21465912 is about 4633.1319860328. The cubic root of 21465912 is about 277.9178543761.

The spelling of 21465912 in words is "twenty-one million, four hundred sixty-five thousand, nine hundred twelve".