1213311223031 has 4 divisors (see below), whose sum is σ = 1220089498200. Its totient is φ = 1206532947864.

The previous prime is 1213311223013. The next prime is 1213311223067. The reversal of 1213311223031 is 1303221133121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213311223031 - 2¹⁰ = 1213311222007 is a prime.

It is a super-2 number, since 2×1213311223031² (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 = 1213311222988 and 1213311223006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213311223231) 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, 3389137316 + ... + 3389137673.

It is an arithmetic number, because the mean of its divisors is an integer number (305022374550).

Almost surely, 2^{1213311223031} is an apocalyptic number.

1213311223031 is a deficient number, since it is larger than the sum of its proper divisors (6778275169).

1213311223031 is an equidigital number, since it uses as much as digits as its factorization.

1213311223031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6778275168.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1213311223031 its reverse (1303221133121), we get a palindrome (2516532356152).

The spelling of 1213311223031 in words is "one trillion, two hundred thirteen billion, three hundred eleven million, two hundred twenty-three thousand, thirty-one".