1213212331031 has 4 divisors (see below), whose sum is σ = 1213243155600. Its totient is φ = 1213181506464.

The previous prime is 1213212331003. The next prime is 1213212331069. The reversal of 1213212331031 is 1301332123121.

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 1213212331031 - 2¹⁰ = 1213212330007 is a prime.

It is a super-2 number, since 2×1213212331031² (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 = 1213212330988 and 1213212331006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213212331531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15353171 + ... + 15431988.

It is an arithmetic number, because the mean of its divisors is an integer number (303310788900).

Almost surely, 2^{1213212331031} is an apocalyptic number.

1213212331031 is a deficient number, since it is larger than the sum of its proper divisors (30824569).

1213212331031 is an equidigital number, since it uses as much as digits as its factorization.

1213212331031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30824568.

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

Adding to 1213212331031 its reverse (1301332123121), we get a palindrome (2514544454152).

The spelling of 1213212331031 in words is "one trillion, two hundred thirteen billion, two hundred twelve million, three hundred thirty-one thousand, thirty-one".