22231221131 has 4 divisors (see below), whose sum is σ = 25407109872. Its totient is φ = 19055332392.

The previous prime is 22231221109. The next prime is 22231221137. The reversal of 22231221131 is 13112213222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13112213222 = 2 ⋅6556106611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22231221131 is a prime.

It is a super-2 number, since 2×22231221131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22231221137) 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, 1587944360 + ... + 1587944373.

It is an arithmetic number, because the mean of its divisors is an integer number (6351777468).

Almost surely, 2^22231221131 is an apocalyptic number.

22231221131 is a deficient number, since it is larger than the sum of its proper divisors (3175888741).

22231221131 is an equidigital number, since it uses as much as digits as its factorization.

22231221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3175888740.

The product of its digits is 288, while the sum is 20.

Adding to 22231221131 its reverse (13112213222), we get a palindrome (35343434353).

The spelling of 22231221131 in words is "twenty-two billion, two hundred thirty-one million, two hundred twenty-one thousand, one hundred thirty-one".