2221312231 has 2 divisors, whose sum is σ = 2221312232. Its totient is φ = 2221312230.

The previous prime is 2221312229. The next prime is 2221312241. The reversal of 2221312231 is 1322131222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2221312231 - 2¹ = 2221312229 is a prime.

It is a super-2 number, since 2×2221312231² = 9868456055180394722, which contains 22 as substring.

Together with 2221312229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2221312199 and 2221312208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221312241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110656115 + 1110656116.

It is an arithmetic number, because the mean of its divisors is an integer number (1110656116).

Almost surely, 2^2221312231 is an apocalyptic number.

2221312231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221312231 is an equidigital number, since it uses as much as digits as its factorization.

2221312231 is an evil number, because the sum of its binary digits is even.

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

The square root of 2221312231 is about 47130.7991763348. The cubic root of 2221312231 is about 1304.7777313108. Note that the first 4 decimals are identical.

Adding to 2221312231 its reverse (1322131222), we get a palindrome (3543443453).

The spelling of 2221312231 in words is "two billion, two hundred twenty-one million, three hundred twelve thousand, two hundred thirty-one".