11312021131 has 2 divisors, whose sum is σ = 11312021132. Its totient is φ = 11312021130.

The previous prime is 11312021101. The next prime is 11312021141. The reversal of 11312021131 is 13112021311.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11312021131 - 2⁷ = 11312021003 is a prime.

It is a super-2 number, since 2×11312021131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11312021101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5656010565 + 5656010566.

It is an arithmetic number, because the mean of its divisors is an integer number (5656010566).

Almost surely, 2^11312021131 is an apocalyptic number.

11312021131 is a deficient number, since it is larger than the sum of its proper divisors (1).

11312021131 is an equidigital number, since it uses as much as digits as its factorization.

11312021131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11312021131 its reverse (13112021311), we get a palindrome (24424042442).

The spelling of 11312021131 in words is "eleven billion, three hundred twelve million, twenty-one thousand, one hundred thirty-one".