31021677121 has 2 divisors, whose sum is σ = 31021677122. Its totient is φ = 31021677120.

The previous prime is 31021677109. The next prime is 31021677143. The reversal of 31021677121 is 12177612013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30167868721 + 853808400 = 173689^2 + 29220^2 .

It is a cyclic number.

It is not a de Polignac number, because 31021677121 - 2¹¹ = 31021675073 is a prime.

It is not a weakly prime, because it can be changed into another prime (31021677151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510838560 + 15510838561.

It is an arithmetic number, because the mean of its divisors is an integer number (15510838561).

Almost surely, 2^31021677121 is an apocalyptic number.

It is an amenable number.

31021677121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31021677121 is an equidigital number, since it uses as much as digits as its factorization.

31021677121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 31.

The spelling of 31021677121 in words is "thirty-one billion, twenty-one million, six hundred seventy-seven thousand, one hundred twenty-one".