13121231213 has 16 divisors (see below), whose sum is σ = 13677568512. Its totient is φ = 12573792000.

The previous prime is 13121231141. The next prime is 13121231239. The reversal of 13121231213 is 31213212131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13121231213 - 2¹⁴ = 13121214829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121231813) 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, 1415273 + ... + 1424513.

It is an arithmetic number, because the mean of its divisors is an integer number (854848032).

Almost surely, 2^13121231213 is an apocalyptic number.

It is an amenable number.

13121231213 is a deficient number, since it is larger than the sum of its proper divisors (556337299).

13121231213 is a wasteful number, since it uses less digits than its factorization.

13121231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9716.

The product of its digits is 216, while the sum is 20.

Adding to 13121231213 its reverse (31213212131), we get a palindrome (44334443344).

The spelling of 13121231213 in words is "thirteen billion, one hundred twenty-one million, two hundred thirty-one thousand, two hundred thirteen".