21874512 has 80 divisors (see below), whose sum is σ = 65299392. Its totient is φ = 6236160.

The previous prime is 21874481. The next prime is 21874513. The reversal of 21874512 is 21547812.

It is a self number, because there is not a number n which added to its sum of digits gives 21874512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21874513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7758 + ... + 10194.

Almost surely, 2^21874512 is an apocalyptic number.

21874512 is a gapful number since it is divisible by the number (22) 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 21874512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32649696).

21874512 is an abundant number, since it is smaller than the sum of its proper divisors (43424880).

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

21874512 is a wasteful number, since it uses less digits than its factorization.

21874512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2476 (or 2470 counting only the distinct ones).

The product of its digits is 4480, while the sum is 30.

The square root of 21874512 is about 4677.0195637820. The cubic root of 21874512 is about 279.6701558089.

The spelling of 21874512 in words is "twenty-one million, eight hundred seventy-four thousand, five hundred twelve".