31212111199999 has 2 divisors, whose sum is σ = 31212111200000. Its totient is φ = 31212111199998.

The previous prime is 31212111199981. The next prime is 31212111200047. The reversal of 31212111199999 is 99999111121213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31212111199999 - 2⁵ = 31212111199967 is a prime.

It is a super-2 number, since 2×31212111199999² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212111199949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606055599999 + 15606055600000.

It is an arithmetic number, because the mean of its divisors is an integer number (15606055600000).

Almost surely, 2^{31212111199999} is an apocalyptic number.

31212111199999 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212111199999 is an equidigital number, since it uses as much as digits as its factorization.

31212111199999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 708588, while the sum is 58.

The spelling of 31212111199999 in words is "thirty-one trillion, two hundred twelve billion, one hundred eleven million, one hundred ninety-nine thousand, nine hundred ninety-nine".