22521621 has 8 divisors (see below), whose sum is σ = 30052384. Its totient is φ = 15002640.

The previous prime is 22521619. The next prime is 22521643. The reversal of 22521621 is 12612522.

It is a happy number.

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

It is not a de Polignac number, because 22521621 - 2¹ = 22521619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22561621) 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, 3591 + ... + 7611.

It is an arithmetic number, because the mean of its divisors is an integer number (3756548).

Almost surely, 2^22521621 is an apocalyptic number.

It is an amenable number.

22521621 is a deficient number, since it is larger than the sum of its proper divisors (7530763).

22521621 is a wasteful number, since it uses less digits than its factorization.

22521621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5891.

The product of its digits is 480, while the sum is 21.

The square root of 22521621 is about 4745.6949965205. The cubic root of 22521621 is about 282.4012070037.

Subtracting from 22521621 its reverse (12612522), we obtain a palindrome (9909099).

The spelling of 22521621 in words is "twenty-two million, five hundred twenty-one thousand, six hundred twenty-one".