22572021 has 8 divisors (see below), whose sum is σ = 30138624. Its totient is φ = 15026720.

The previous prime is 22571987. The next prime is 22572029. The reversal of 22572021 is 12027522.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22572021 - 2⁶ = 22571957 is a prime.

It is a super-2 number, since 2×22572021² = 1018992264048882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22572029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2661 + ... + 7226.

It is an arithmetic number, because the mean of its divisors is an integer number (3767328).

Almost surely, 2^22572021 is an apocalyptic number.

It is an amenable number.

22572021 is a deficient number, since it is larger than the sum of its proper divisors (7566603).

22572021 is an equidigital number, since it uses as much as digits as its factorization.

22572021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10651.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 22572021 is about 4751.0021048196. The cubic root of 22572021 is about 282.6117071995.

Adding to 22572021 its reverse (12027522), we get a palindrome (34599543).

It can be divided in two parts, 2257 and 2021, that added together give a triangular number (4278 = T₉₂).

The spelling of 22572021 in words is "twenty-two million, five hundred seventy-two thousand, twenty-one".