22052521 has 4 divisors (see below), whose sum is σ = 23213200. Its totient is φ = 20891844.

The previous prime is 22052491. The next prime is 22052533. The reversal of 22052521 is 12525022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22052521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1160659 = 22052521 / (2 + 2 + 0 + 5 + 2 + 5 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22052551) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 580311 + ... + 580348.

It is an arithmetic number, because the mean of its divisors is an integer number (5803300).

Almost surely, 2^22052521 is an apocalyptic number.

It is an amenable number.

22052521 is a deficient number, since it is larger than the sum of its proper divisors (1160679).

22052521 is a wasteful number, since it uses less digits than its factorization.

22052521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160678.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 22052521 is about 4696.0111797141. The cubic root of 22052521 is about 280.4267345082.

Adding to 22052521 its reverse (12525022), we get a palindrome (34577543).

The spelling of 22052521 in words is "twenty-two million, fifty-two thousand, five hundred twenty-one".