22120521 has 4 divisors (see below), whose sum is σ = 29494032. Its totient is φ = 14747012.

The previous prime is 22120517. The next prime is 22120531. The reversal of 22120521 is 12502122.

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 not a de Polignac number, because 22120521 - 2² = 22120517 is a prime.

It is a super-2 number, since 2×22120521² = 978634898622882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22120521.

It is not an unprimeable number, because it can be changed into a prime (22120531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3686751 + ... + 3686756.

It is an arithmetic number, because the mean of its divisors is an integer number (7373508).

Almost surely, 2^22120521 is an apocalyptic number.

It is an amenable number.

22120521 is a deficient number, since it is larger than the sum of its proper divisors (7373511).

22120521 is an equidigital number, since it uses as much as digits as its factorization.

22120521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7373510.

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

The square root of 22120521 is about 4703.2457941298. The cubic root of 22120521 is about 280.7146751534.

Adding to 22120521 its reverse (12502122), we get a palindrome (34622643).

The spelling of 22120521 in words is "twenty-two million, one hundred twenty thousand, five hundred twenty-one".