31021243427 has 2 divisors, whose sum is σ = 31021243428. Its totient is φ = 31021243426.

The previous prime is 31021243369. The next prime is 31021243447. The reversal of 31021243427 is 72434212013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31021243427 - 2¹⁴ = 31021227043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31021243427.

It is not a weakly prime, because it can be changed into another prime (31021243447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510621713 + 15510621714.

It is an arithmetic number, because the mean of its divisors is an integer number (15510621714).

Almost surely, 2^31021243427 is an apocalyptic number.

31021243427 is a deficient number, since it is larger than the sum of its proper divisors (1).

31021243427 is an equidigital number, since it uses as much as digits as its factorization.

31021243427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 29.

The spelling of 31021243427 in words is "thirty-one billion, twenty-one million, two hundred forty-three thousand, four hundred twenty-seven".