22521057 has 8 divisors (see below), whose sum is σ = 32337984. Its totient is φ = 13859088.

The previous prime is 22521041. The next prime is 22521089. The reversal of 22521057 is 75012522.

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

It is not a de Polignac number, because 22521057 - 2⁴ = 22521041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22521757) 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 7 ways as a sum of consecutive naturals, for example, 288693 + ... + 288770.

It is an arithmetic number, because the mean of its divisors is an integer number (4042248).

Almost surely, 2^22521057 is an apocalyptic number.

It is an amenable number.

22521057 is a deficient number, since it is larger than the sum of its proper divisors (9816927).

22521057 is a wasteful number, since it uses less digits than its factorization.

22521057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577479.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 22521057 is about 4745.6355738721. The cubic root of 22521057 is about 282.3988496303.

Adding to 22521057 its reverse (75012522), we get a palindrome (97533579).

The spelling of 22521057 in words is "twenty-two million, five hundred twenty-one thousand, fifty-seven".