23021572 has 36 divisors (see below), whose sum is σ = 47536860. Its totient is φ = 9725184.

The previous prime is 23021567. The next prime is 23021639. The reversal of 23021572 is 27512032.

It can be written as a sum of positive squares in 2 ways, for example, as 18957316 + 4064256 = 4354^2 + 2016^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13504 + ... + 15112.

Almost surely, 2^23021572 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 23021572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23768430).

23021572 is an abundant number, since it is smaller than the sum of its proper divisors (24515288).

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

23021572 is a wasteful number, since it uses less digits than its factorization.

23021572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700 (or 1691 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 23021572 is about 4798.0800326797. The cubic root of 23021572 is about 284.4755802008.

The spelling of 23021572 in words is "twenty-three million, twenty-one thousand, five hundred seventy-two".