11312031231221 has 12 divisors (see below), whose sum is σ = 13158952362432. Its totient is φ = 9695983377528.

The previous prime is 11312031231217. The next prime is 11312031231227. The reversal of 11312031231221 is 12213213021311.

It is a happy number.

It is not a de Polignac number, because 11312031231221 - 2² = 11312031231217 is a prime.

It is a super-2 number, since 2×11312031231221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11312031231227) 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 11 ways as a sum of consecutive naturals, for example, 15663146 + ... + 16369428.

It is an arithmetic number, because the mean of its divisors is an integer number (1096579363536).

Almost surely, 2^{11312031231221} is an apocalyptic number.

It is an amenable number.

11312031231221 is a deficient number, since it is larger than the sum of its proper divisors (1846921131211).

11312031231221 is an equidigital number, since it uses as much as digits as its factorization.

11312031231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033160 (or 1033153 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 11312031231221 its reverse (12213213021311), we get a palindrome (23525244252532).

The spelling of 11312031231221 in words is "eleven trillion, three hundred twelve billion, thirty-one million, two hundred thirty-one thousand, two hundred twenty-one".