1213231100331 has 4 divisors (see below), whose sum is σ = 1617641467112. Its totient is φ = 808820733552.

The previous prime is 1213231100329. The next prime is 1213231100377. The reversal of 1213231100331 is 1330011323121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1213231100331 - 2¹ = 1213231100329 is a prime.

It is a super-2 number, since 2×1213231100331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213231100298 and 1213231100307.

It is not an unprimeable number, because it can be changed into a prime (1213231100231) 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, 202205183386 + ... + 202205183391.

It is an arithmetic number, because the mean of its divisors is an integer number (404410366778).

Almost surely, 2^{1213231100331} is an apocalyptic number.

1213231100331 is a deficient number, since it is larger than the sum of its proper divisors (404410366781).

1213231100331 is an equidigital number, since it uses as much as digits as its factorization.

1213231100331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404410366780.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 1213231100331 its reverse (1330011323121), we get a palindrome (2543242423452).

The spelling of 1213231100331 in words is "one trillion, two hundred thirteen billion, two hundred thirty-one million, one hundred thousand, three hundred thirty-one".