1131231222121 has 32 divisors (see below), whose sum is σ = 1522239264000. Its totient is φ = 811860295680.

The previous prime is 1131231222109. The next prime is 1131231222169. The reversal of 1131231222121 is 1212221321311.

It is a happy number.

It is not a de Polignac number, because 1131231222121 - 2²⁷ = 1131097004393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1131231222092 and 1131231222101.

It is not an unprimeable number, because it can be changed into a prime (1131231222101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 809016 + ... + 1707913.

It is an arithmetic number, because the mean of its divisors is an integer number (47569977000).

Almost surely, 2^{1131231222121} is an apocalyptic number.

1131231222121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1131231222121 is a deficient number, since it is larger than the sum of its proper divisors (391008041879).

1131231222121 is a wasteful number, since it uses less digits than its factorization.

1131231222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517409.

The product of its digits is 288, while the sum is 22.

Adding to 1131231222121 its reverse (1212221321311), we get a palindrome (2343452543432).

The spelling of 1131231222121 in words is "one trillion, one hundred thirty-one billion, two hundred thirty-one million, two hundred twenty-two thousand, one hundred twenty-one".