22521138 has 8 divisors (see below), whose sum is σ = 45042288. Its totient is φ = 7507044.

The previous prime is 22521133. The next prime is 22521193. The reversal of 22521138 is 83112522.

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

22521138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (22521133) 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, 1876756 + ... + 1876767.

It is an arithmetic number, because the mean of its divisors is an integer number (5630286).

Almost surely, 2^22521138 is an apocalyptic number.

22521138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

22521138 is a wasteful number, since it uses less digits than its factorization.

22521138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753528.

The product of its digits is 960, while the sum is 24.

The square root of 22521138 is about 4745.6441080216. The cubic root of 22521138 is about 282.3991881917.

The spelling of 22521138 in words is "twenty-two million, five hundred twenty-one thousand, one hundred thirty-eight".