212312099999 has 4 divisors (see below), whose sum is σ = 212313266760. Its totient is φ = 212310933240.

The previous prime is 212312099977. The next prime is 212312100043. The reversal of 212312099999 is 999990213212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212312099999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212312099929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245009 + ... + 696170.

It is an arithmetic number, because the mean of its divisors is an integer number (53078316690).

Almost surely, 2^212312099999 is an apocalyptic number.

212312099999 is a deficient number, since it is larger than the sum of its proper divisors (1166761).

212312099999 is an equidigital number, since it uses as much as digits as its factorization.

212312099999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166760.

The product of its (nonzero) digits is 1417176, while the sum is 56.

The spelling of 212312099999 in words is "two hundred twelve billion, three hundred twelve million, ninety-nine thousand, nine hundred ninety-nine".