1312331021211 has 24 divisors (see below), whose sum is σ = 2046697829904. Its totient is φ = 745760312640.

The previous prime is 1312331021203. The next prime is 1312331021257. The reversal of 1312331021211 is 1121201332131.

It is not a de Polignac number, because 1312331021211 - 2³ = 1312331021203 is a prime.

It is a super-2 number, since 2×1312331021211² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1312331021411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24634780 + ... + 24687993.

It is an arithmetic number, because the mean of its divisors is an integer number (85279076246).

Almost surely, 2^{1312331021211} is an apocalyptic number.

1312331021211 is a deficient number, since it is larger than the sum of its proper divisors (734366808693).

1312331021211 is a wasteful number, since it uses less digits than its factorization.

1312331021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49322971 (or 49322964 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1312331021211 its reverse (1121201332131), we get a palindrome (2433532353342).

The spelling of 1312331021211 in words is "one trillion, three hundred twelve billion, three hundred thirty-one million, twenty-one thousand, two hundred eleven".