22131003221 has 4 divisors (see below), whose sum is σ = 22217116332. Its totient is φ = 22044890112.

The previous prime is 22131003211. The next prime is 22131003253. The reversal of 22131003221 is 12230013122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16357131025 + 5773872196 = 127895^2 + 75986^2 .

It is a cyclic number.

It is not a de Polignac number, because 22131003221 - 2²² = 22126808917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22131003221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131003211) 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, 43056170 + ... + 43056683.

It is an arithmetic number, because the mean of its divisors is an integer number (5554279083).

Almost surely, 2^22131003221 is an apocalyptic number.

It is an amenable number.

22131003221 is a deficient number, since it is larger than the sum of its proper divisors (86113111).

22131003221 is an equidigital number, since it uses as much as digits as its factorization.

22131003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86113110.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 22131003221 its reverse (12230013122), we get a palindrome (34361016343).

Subtracting from 22131003221 its reverse (12230013122), we obtain a palindrome (9900990099).

The spelling of 22131003221 in words is "twenty-two billion, one hundred thirty-one million, three thousand, two hundred twenty-one".