21319572 has 48 divisors (see below), whose sum is σ = 51645440. Its totient is φ = 6840288.

The previous prime is 21319567. The next prime is 21319603. The reversal of 21319572 is 27591312.

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, 40503 + ... + 41025.

Almost surely, 2^21319572 is an apocalyptic number.

It is an amenable number.

21319572 is an abundant number, since it is smaller than the sum of its proper divisors (30325868).

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

21319572 is a wasteful number, since it uses less digits than its factorization.

21319572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 650 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 21319572 is about 4617.3122051687. The cubic root of 21319572 is about 277.2848620653.

The spelling of 21319572 in words is "twenty-one million, three hundred nineteen thousand, five hundred seventy-two".