22221021231 has 12 divisors (see below), whose sum is σ = 32309595760. Its totient is φ = 14715907200.

The previous prime is 22221021191. The next prime is 22221021233. The reversal of 22221021231 is 13212012222.

22221021231 is a `hidden beast` number, since 222 + 210 + 2 + 1 + 231 = 666.

It is not a de Polignac number, because 22221021231 - 2⁶ = 22221021167 is a prime.

It is a super-2 number, since 2×22221021231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221021233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8174146 + ... + 8176863.

Almost surely, 2^22221021231 is an apocalyptic number.

22221021231 is a deficient number, since it is larger than the sum of its proper divisors (10088574529).

22221021231 is a wasteful number, since it uses less digits than its factorization.

22221021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16351166 (or 16351163 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 22221021231 its reverse (13212012222), we get a palindrome (35433033453).

Subtracting from 22221021231 its reverse (13212012222), we obtain a palindrome (9009009009).

The spelling of 22221021231 in words is "twenty-two billion, two hundred twenty-one million, twenty-one thousand, two hundred thirty-one".