31213212222097 has 2 divisors, whose sum is σ = 31213212222098. Its totient is φ = 31213212222096.

The previous prime is 31213212222053. The next prime is 31213212222103. The reversal of 31213212222097 is 79022221231213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17357814045441 + 13855398176656 = 4166271^2 + 3722284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31213212222097 is a prime.

It is not a weakly prime, because it can be changed into another prime (31213212222397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606606111048 + 15606606111049.

It is an arithmetic number, because the mean of its divisors is an integer number (15606606111049).

Almost surely, 2^{31213212222097} is an apocalyptic number.

It is an amenable number.

31213212222097 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213212222097 is an equidigital number, since it uses as much as digits as its factorization.

31213212222097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 31213212222097 in words is "thirty-one trillion, two hundred thirteen billion, two hundred twelve million, two hundred twenty-two thousand, ninety-seven".