1231322212999 has 4 divisors (see below), whose sum is σ = 1231355576664. Its totient is φ = 1231288849336.

The previous prime is 1231322212963. The next prime is 1231322213027. The reversal of 1231322212999 is 9992122231321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231322212999 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 (1231322242999) 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, 16626412 + ... + 16700305.

It is an arithmetic number, because the mean of its divisors is an integer number (307838894166).

Almost surely, 2^{1231322212999} is an apocalyptic number.

1231322212999 is a deficient number, since it is larger than the sum of its proper divisors (33363665).

1231322212999 is an equidigital number, since it uses as much as digits as its factorization.

1231322212999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33363664.

The product of its digits is 209952, while the sum is 46.

The spelling of 1231322212999 in words is "one trillion, two hundred thirty-one billion, three hundred twenty-two million, two hundred twelve thousand, nine hundred ninety-nine".