21912264 has 96 divisors (see below), whose sum is σ = 65800800. Its totient is φ = 6531840.

The previous prime is 21912259. The next prime is 21912271. The reversal of 21912264 is 46221912.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57627 + ... + 58005.

It is an arithmetic number, because the mean of its divisors is an integer number (685425).

Almost surely, 2^21912264 is an apocalyptic number.

21912264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21912264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32900400).

21912264 is an abundant number, since it is smaller than the sum of its proper divisors (43888536).

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

21912264 is a wasteful number, since it uses less digits than its factorization.

21912264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 468 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 21912264 is about 4681.0537275276. The cubic root of 21912264 is about 279.8309523812.

The spelling of 21912264 in words is "twenty-one million, nine hundred twelve thousand, two hundred sixty-four".