21814672 has 80 divisors (see below), whose sum is σ = 51103872. Its totient is φ = 8898560.

The previous prime is 21814633. The next prime is 21814703. The reversal of 21814672 is 27641812.

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, 68658 + ... + 68974.

Almost surely, 2^21814672 is an apocalyptic number.

21814672 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 21814672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25551936).

21814672 is an abundant number, since it is smaller than the sum of its proper divisors (29289200).

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

21814672 is a wasteful number, since it uses less digits than its factorization.

21814672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 370 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 21814672 is about 4670.6179462679. The cubic root of 21814672 is about 279.4149006533.

The spelling of 21814672 in words is "twenty-one million, eight hundred fourteen thousand, six hundred seventy-two".