1213231332121 has 4 divisors (see below), whose sum is σ = 1215007659792. Its totient is φ = 1211455004452.

The previous prime is 1213231331957. The next prime is 1213231332127. The reversal of 1213231332121 is 1212331323121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213231332121 - 2¹⁵ = 1213231299353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213231332127) 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, 888162811 + ... + 888164176.

It is an arithmetic number, because the mean of its divisors is an integer number (303751914948).

Almost surely, 2^{1213231332121} is an apocalyptic number.

It is an amenable number.

1213231332121 is a deficient number, since it is larger than the sum of its proper divisors (1776327671).

1213231332121 is an equidigital number, since it uses as much as digits as its factorization.

1213231332121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776327670.

The product of its digits is 1296, while the sum is 25.

Adding to 1213231332121 its reverse (1212331323121), we get a palindrome (2425562655242).

The spelling of 1213231332121 in words is "one trillion, two hundred thirteen billion, two hundred thirty-one million, three hundred thirty-two thousand, one hundred twenty-one".