21222412231 has 2 divisors, whose sum is σ = 21222412232. Its totient is φ = 21222412230.

The previous prime is 21222412157. The next prime is 21222412241. The reversal of 21222412231 is 13221422212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21222412231 - 2²¹ = 21220315079 is a prime.

It is a super-2 number, since 2×21222412231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222412241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611206115 + 10611206116.

It is an arithmetic number, because the mean of its divisors is an integer number (10611206116).

Almost surely, 2^21222412231 is an apocalyptic number.

21222412231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222412231 is an equidigital number, since it uses as much as digits as its factorization.

21222412231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 22.

Adding to 21222412231 its reverse (13221422212), we get a palindrome (34443834443).

The spelling of 21222412231 in words is "twenty-one billion, two hundred twenty-two million, four hundred twelve thousand, two hundred thirty-one".