211230031291 has 2 divisors, whose sum is σ = 211230031292. Its totient is φ = 211230031290.

The previous prime is 211230031283. The next prime is 211230031301. The reversal of 211230031291 is 192130032112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211230031291 - 2³ = 211230031283 is a prime.

It is a super-2 number, since 2×211230031291² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211230031391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105615015645 + 105615015646.

It is an arithmetic number, because the mean of its divisors is an integer number (105615015646).

Almost surely, 2^211230031291 is an apocalyptic number.

211230031291 is a deficient number, since it is larger than the sum of its proper divisors (1).

211230031291 is an equidigital number, since it uses as much as digits as its factorization.

211230031291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 211230031291 in words is "two hundred eleven billion, two hundred thirty million, thirty-one thousand, two hundred ninety-one".