22521021 has 8 divisors (see below), whose sum is σ = 30078144. Its totient is φ = 14988960.

The previous prime is 22520999. The next prime is 22521041. The reversal of 22521021 is 12012522.

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

It is not a de Polignac number, because 22521021 - 2⁵ = 22520989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22521041) 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, 4056 + ... + 7841.

It is an arithmetic number, because the mean of its divisors is an integer number (3759768).

Almost surely, 2^22521021 is an apocalyptic number.

It is an amenable number.

22521021 is a deficient number, since it is larger than the sum of its proper divisors (7557123).

22521021 is a wasteful number, since it uses less digits than its factorization.

22521021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12531.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 22521021 is about 4745.6317809118. The cubic root of 22521021 is about 282.3986991583.

Adding to 22521021 its reverse (12012522), we get a palindrome (34533543).

The spelling of 22521021 in words is "twenty-two million, five hundred twenty-one thousand, twenty-one".