22605521 has 4 divisors (see below), whose sum is σ = 22625844. Its totient is φ = 22585200.

The previous prime is 22605509. The next prime is 22605547. The reversal of 22605521 is 12550622.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17106496 + 5499025 = 4136^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 22605521 - 2¹⁰ = 22604497 is a prime.

It is a super-2 number, since 2×22605521² = 1022019159362882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22605571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8390 + ... + 10751.

It is an arithmetic number, because the mean of its divisors is an integer number (5656461).

Almost surely, 2^22605521 is an apocalyptic number.

It is an amenable number.

22605521 is a deficient number, since it is larger than the sum of its proper divisors (20323).

22605521 is a wasteful number, since it uses less digits than its factorization.

22605521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20322.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 22605521 is about 4754.5263696818. The cubic root of 22605521 is about 282.7514497058.

The spelling of 22605521 in words is "twenty-two million, six hundred five thousand, five hundred twenty-one".