1213213637969 has 4 divisors (see below), whose sum is σ = 1239026694144. Its totient is φ = 1187400581796.

The previous prime is 1213213637891. The next prime is 1213213637983. The reversal of 1213213637969 is 9697363123121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213213637969 - 2²⁴ = 1213196860753 is a prime.

It is a super-2 number, since 2×1213213637969² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213213637969.

It is not an unprimeable number, because it can be changed into a prime (1213213637369) 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, 12906528017 + ... + 12906528110.

It is an arithmetic number, because the mean of its divisors is an integer number (309756673536).

Almost surely, 2^{1213213637969} is an apocalyptic number.

It is an amenable number.

1213213637969 is a deficient number, since it is larger than the sum of its proper divisors (25813056175).

1213213637969 is an equidigital number, since it uses as much as digits as its factorization.

1213213637969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25813056174.

The product of its digits is 2204496, while the sum is 53.

The spelling of 1213213637969 in words is "one trillion, two hundred thirteen billion, two hundred thirteen million, six hundred thirty-seven thousand, nine hundred sixty-nine".