31104701021 has 2 divisors, whose sum is σ = 31104701022. Its totient is φ = 31104701020.

The previous prime is 31104701009. The next prime is 31104701027. The reversal of 31104701021 is 12010740113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29494284121 + 1610416900 = 171739^2 + 40130^2 .

It is an emirp because it is prime and its reverse (12010740113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31104701021 - 2¹⁸ = 31104438877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31104700984 and 31104701002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31104701027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15552350510 + 15552350511.

It is an arithmetic number, because the mean of its divisors is an integer number (15552350511).

Almost surely, 2^31104701021 is an apocalyptic number.

It is an amenable number.

31104701021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31104701021 is an equidigital number, since it uses as much as digits as its factorization.

31104701021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The spelling of 31104701021 in words is "thirty-one billion, one hundred four million, seven hundred one thousand, twenty-one".