31020421291 has 2 divisors, whose sum is σ = 31020421292. Its totient is φ = 31020421290.

The previous prime is 31020421247. The next prime is 31020421337. The reversal of 31020421291 is 19212402013.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31020421291 - 2¹⁷ = 31020290219 is a prime.

It is a super-2 number, since 2×31020421291² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31020425291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510210645 + 15510210646.

It is an arithmetic number, because the mean of its divisors is an integer number (15510210646).

Almost surely, 2^31020421291 is an apocalyptic number.

31020421291 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020421291 is an equidigital number, since it uses as much as digits as its factorization.

31020421291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 31020421291 in words is "thirty-one billion, twenty million, four hundred twenty-one thousand, two hundred ninety-one".