1231331132121 has 32 divisors (see below), whose sum is σ = 1665610214400. Its totient is φ = 809060216640.

The previous prime is 1231331132107. The next prime is 1231331132149. The reversal of 1231331132121 is 1212311331321.

It is not a de Polignac number, because 1231331132121 - 2¹⁵ = 1231331099353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231331132091 and 1231331132100.

It is not an unprimeable number, because it can be changed into a prime (1231331132191) 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, 218357020 + ... + 218362658.

It is an arithmetic number, because the mean of its divisors is an integer number (52050319200).

Almost surely, 2^{1231331132121} is an apocalyptic number.

It is an amenable number.

1231331132121 is a deficient number, since it is larger than the sum of its proper divisors (434279082279).

1231331132121 is a wasteful number, since it uses less digits than its factorization.

1231331132121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9469.

The product of its digits is 648, while the sum is 24.

Adding to 1231331132121 its reverse (1212311331321), we get a palindrome (2443642463442).

The spelling of 1231331132121 in words is "one trillion, two hundred thirty-one billion, three hundred thirty-one million, one hundred thirty-two thousand, one hundred twenty-one".