1231211320312 has 8 divisors (see below), whose sum is σ = 2308521225600. Its totient is φ = 615605660152.

The previous prime is 1231211320291. The next prime is 1231211320327. The reversal of 1231211320312 is 2130231121321.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76950707512 + ... + 76950707527.

It is an arithmetic number, because the mean of its divisors is an integer number (288565153200).

Almost surely, 2^{1231211320312} is an apocalyptic number.

It is an amenable number.

1231211320312 is a deficient number, since it is larger than the sum of its proper divisors (1077309905288).

1231211320312 is a wasteful number, since it uses less digits than its factorization.

1231211320312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153901415045 (or 153901415041 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1231211320312 its reverse (2130231121321), we get a palindrome (3361442441633).

The spelling of 1231211320312 in words is "one trillion, two hundred thirty-one billion, two hundred eleven million, three hundred twenty thousand, three hundred twelve".