21892572 has 96 divisors (see below), whose sum is σ = 63221760. Its totient is φ = 6505920.

The previous prime is 21892529. The next prime is 21892601. The reversal of 21892572 is 27529812.

21892572 is a `hidden beast` number, since 2 + 1 + 89 + 2 + 572 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (20160) is a multiple of the sum of its prime factors (560).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43273 + ... + 43775.

It is an arithmetic number, because the mean of its divisors is an integer number (658560).

Almost surely, 2^21892572 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 21892572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31610880).

21892572 is an abundant number, since it is smaller than the sum of its proper divisors (41329188).

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

21892572 is a wasteful number, since it uses less digits than its factorization.

21892572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560 (or 552 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 21892572 is about 4678.9498821851. The cubic root of 21892572 is about 279.7471015807.

It can be divided in two parts, 2189 and 2572, that added together give a square (4761 = 69²).

The spelling of 21892572 in words is "twenty-one million, eight hundred ninety-two thousand, five hundred seventy-two".