1021312131131 has 4 divisors (see below), whose sum is σ = 1022147219952. Its totient is φ = 1020477042312.

The previous prime is 1021312131107. The next prime is 1021312131143. The reversal of 1021312131131 is 1311312131201.

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-1021312131131 is a prime.

It is a super-2 number, since 2×1021312131131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021312133131) 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, 417542576 + ... + 417545021.

It is an arithmetic number, because the mean of its divisors is an integer number (255536804988).

Almost surely, 2^{1021312131131} is an apocalyptic number.

1021312131131 is a deficient number, since it is larger than the sum of its proper divisors (835088821).

1021312131131 is an equidigital number, since it uses as much as digits as its factorization.

1021312131131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835088820.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 1021312131131 its reverse (1311312131201), we get a palindrome (2332624262332).

The spelling of 1021312131131 in words is "one trillion, twenty-one billion, three hundred twelve million, one hundred thirty-one thousand, one hundred thirty-one".