2221031231 has 2 divisors, whose sum is σ = 2221031232. Its totient is φ = 2221031230.

The previous prime is 2221031203. The next prime is 2221031233. The reversal of 2221031231 is 1321301222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2221031231 - 2²² = 2216836927 is a prime.

It is a super-2 number, since 2×2221031231² = 9865959458154750722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2221031233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221031233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110515615 + 1110515616.

It is an arithmetic number, because the mean of its divisors is an integer number (1110515616).

Almost surely, 2^2221031231 is an apocalyptic number.

2221031231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221031231 is an equidigital number, since it uses as much as digits as its factorization.

2221031231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2221031231 is about 47127.8180165388. The cubic root of 2221031231 is about 1304.7227100793.

Adding to 2221031231 its reverse (1321301222), we get a palindrome (3542332453).

The spelling of 2221031231 in words is "two billion, two hundred twenty-one million, thirty-one thousand, two hundred thirty-one".