11312021331131 has 4 divisors (see below), whose sum is σ = 11803848345552. Its totient is φ = 10820194316712.

The previous prime is 11312021331097. The next prime is 11312021331181. The reversal of 11312021331131 is 13113312021311.

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 11312021331131 - 2¹⁸ = 11312021068987 is a prime.

It is a super-2 number, since 2×11312021331131² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 491827014397 = 11312021331131 / (1 + 1 + 3 + 1 + 2 + 0 + 2 + 1 + 3 + 3 + 1 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11312021331097 and 11312021331106.

It is not an unprimeable number, because it can be changed into a prime (11312021331181) 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, 245913507176 + ... + 245913507221.

It is an arithmetic number, because the mean of its divisors is an integer number (2950962086388).

Almost surely, 2^{11312021331131} is an apocalyptic number.

11312021331131 is a deficient number, since it is larger than the sum of its proper divisors (491827014421).

11312021331131 is an equidigital number, since it uses as much as digits as its factorization.

11312021331131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491827014420.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 11312021331131 its reverse (13113312021311), we get a palindrome (24425333352442).

The spelling of 11312021331131 in words is "eleven trillion, three hundred twelve billion, twenty-one million, three hundred thirty-one thousand, one hundred thirty-one".