312021430129891 has 2 divisors, whose sum is σ = 312021430129892. Its totient is φ = 312021430129890.

The previous prime is 312021430129867. The next prime is 312021430129949. The reversal of 312021430129891 is 198921034120213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312021430129891 - 2¹¹ = 312021430127843 is a prime.

It is a super-2 number, since 2×312021430129891² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312021430129841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156010715064945 + 156010715064946.

It is an arithmetic number, because the mean of its divisors is an integer number (156010715064946).

Almost surely, 2^{312021430129891} is an apocalyptic number.

312021430129891 is a deficient number, since it is larger than the sum of its proper divisors (1).

312021430129891 is an equidigital number, since it uses as much as digits as its factorization.

312021430129891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 312021430129891 in words is "three hundred twelve trillion, twenty-one billion, four hundred thirty million, one hundred twenty-nine thousand, eight hundred ninety-one".