22021213231 has 2 divisors, whose sum is σ = 22021213232. Its totient is φ = 22021213230.

The previous prime is 22021213223. The next prime is 22021213259. The reversal of 22021213231 is 13231212022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22021213231 - 2³ = 22021213223 is a prime.

It is a super-2 number, since 2×22021213231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22021213199 and 22021213208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22021213031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010606615 + 11010606616.

It is an arithmetic number, because the mean of its divisors is an integer number (11010606616).

Almost surely, 2^22021213231 is an apocalyptic number.

22021213231 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021213231 is an equidigital number, since it uses as much as digits as its factorization.

22021213231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 22021213231 its reverse (13231212022), we get a palindrome (35252425253).

The spelling of 22021213231 in words is "twenty-two billion, twenty-one million, two hundred thirteen thousand, two hundred thirty-one".