1321123121213 has 16 divisors (see below), whose sum is σ = 1595151290880. Its totient is φ = 1070080642176.

The previous prime is 1321123121203. The next prime is 1321123121239. The reversal of 1321123121213 is 3121213211231.

It is a happy number.

It is not a de Polignac number, because 1321123121213 - 2²⁰ = 1321122072637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321123121203) 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, 69224456 + ... + 69243537.

It is an arithmetic number, because the mean of its divisors is an integer number (99696955680).

Almost surely, 2^{1321123121213} is an apocalyptic number.

It is an amenable number.

1321123121213 is a deficient number, since it is larger than the sum of its proper divisors (274028169667).

1321123121213 is a wasteful number, since it uses less digits than its factorization.

1321123121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138468076.

The product of its digits is 432, while the sum is 23.

Adding to 1321123121213 its reverse (3121213211231), we get a palindrome (4442336332444).

The spelling of 1321123121213 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred thirteen".