31113024221 has 2 divisors, whose sum is σ = 31113024222. Its totient is φ = 31113024220.

The previous prime is 31113024211. The next prime is 31113024223. The reversal of 31113024221 is 12242031113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29176056100 + 1936968121 = 170810^2 + 44011^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113024221 - 2⁶ = 31113024157 is a prime.

Together with 31113024223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31113024193 and 31113024202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31113024223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556512110 + 15556512111.

It is an arithmetic number, because the mean of its divisors is an integer number (15556512111).

Almost surely, 2^31113024221 is an apocalyptic number.

It is an amenable number.

31113024221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113024221 is an equidigital number, since it uses as much as digits as its factorization.

31113024221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31113024221 its reverse (12242031113), we get a palindrome (43355055334).

The spelling of 31113024221 in words is "thirty-one billion, one hundred thirteen million, twenty-four thousand, two hundred twenty-one".