1213213203131 has 16 divisors (see below), whose sum is σ = 1283912757600. Its totient is φ = 1144732393728.

The previous prime is 1213213203023. The next prime is 1213213203143. The reversal of 1213213203131 is 1313023123121.

It is a cyclic number.

It is not a de Polignac number, because 1213213203131 - 2¹⁸ = 1213212940987 is a prime.

It is a super-2 number, since 2×1213213203131² (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 = 1213213203097 and 1213213203106.

It is not an unprimeable number, because it can be changed into a prime (1213213203161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2398061 + ... + 2859566.

It is an arithmetic number, because the mean of its divisors is an integer number (80244547350).

Almost surely, 2^{1213213203131} is an apocalyptic number.

1213213203131 is a deficient number, since it is larger than the sum of its proper divisors (70699554469).

1213213203131 is a wasteful number, since it uses less digits than its factorization.

1213213203131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5257838.

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

Adding to 1213213203131 its reverse (1313023123121), we get a palindrome (2526236326252).

The spelling of 1213213203131 in words is "one trillion, two hundred thirteen billion, two hundred thirteen million, two hundred three thousand, one hundred thirty-one".