31222101121 has 2 divisors, whose sum is σ = 31222101122. Its totient is φ = 31222101120.

The previous prime is 31222101109. The next prime is 31222101173. The reversal of 31222101121 is 12110122213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29318000625 + 1904100496 = 171225^2 + 43636^2 .

It is a cyclic number.

It is not a de Polignac number, because 31222101121 - 2⁷ = 31222100993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31222101095 and 31222101104.

It is not a weakly prime, because it can be changed into another prime (31222101721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611050560 + 15611050561.

It is an arithmetic number, because the mean of its divisors is an integer number (15611050561).

Almost surely, 2^31222101121 is an apocalyptic number.

It is an amenable number.

31222101121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31222101121 is an equidigital number, since it uses as much as digits as its factorization.

31222101121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31222101121 its reverse (12110122213), we get a palindrome (43332223334).

The spelling of 31222101121 in words is "thirty-one billion, two hundred twenty-two million, one hundred one thousand, one hundred twenty-one".