1331212012331 has 4 divisors (see below), whose sum is σ = 1332074756592. Its totient is φ = 1330349268072.

The previous prime is 1331212012309. The next prime is 1331212012423. The reversal of 1331212012331 is 1332102121331.

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

It is a cyclic number.

It is not a de Polignac number, because 1331212012331 - 2²⁶ = 1331144903467 is a prime.

It is a super-2 number, since 2×1331212012331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331212012297 and 1331212012306.

It is not an unprimeable number, because it can be changed into a prime (1331212012931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431369816 + ... + 431372901.

It is an arithmetic number, because the mean of its divisors is an integer number (333018689148).

Almost surely, 2^{1331212012331} is an apocalyptic number.

1331212012331 is a deficient number, since it is larger than the sum of its proper divisors (862744261).

1331212012331 is an equidigital number, since it uses as much as digits as its factorization.

1331212012331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862744260.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1331212012331 its reverse (1332102121331), we get a palindrome (2663314133662).

The spelling of 1331212012331 in words is "one trillion, three hundred thirty-one billion, two hundred twelve million, twelve thousand, three hundred thirty-one".