31020322121 has 2 divisors, whose sum is σ = 31020322122. Its totient is φ = 31020322120.

The previous prime is 31020322103. The next prime is 31020322139. The reversal of 31020322121 is 12122302013.

It is a balanced prime because it is at equal distance from previous prime (31020322103) and next prime (31020322139).

It can be written as a sum of positive squares in only one way, i.e., 20243598400 + 10776723721 = 142280^2 + 103811^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020322121 - 2¹⁸ = 31020059977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31020322121.

It is not a weakly prime, because it can be changed into another prime (31020322321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510161060 + 15510161061.

It is an arithmetic number, because the mean of its divisors is an integer number (15510161061).

Almost surely, 2^31020322121 is an apocalyptic number.

It is an amenable number.

31020322121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020322121 is an equidigital number, since it uses as much as digits as its factorization.

31020322121 is an evil number, because the sum of its binary digits is even.

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

Adding to 31020322121 its reverse (12122302013), we get a palindrome (43142624134).

The spelling of 31020322121 in words is "thirty-one billion, twenty million, three hundred twenty-two thousand, one hundred twenty-one".