1213213637968 has 20 divisors (see below), whose sum is σ = 2356184812948. Its totient is φ = 605165944320.

The previous prime is 1213213637891. The next prime is 1213213637983. The reversal of 1213213637968 is 8697363123121.

It can be written as a sum of positive squares in 2 ways, for example, as 478161186064 + 735052451904 = 691492^2 + 857352^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90047721 + ... + 90061192.

Almost surely, 2^{1213213637968} is an apocalyptic number.

It is an amenable number.

1213213637968 is a deficient number, since it is larger than the sum of its proper divisors (1142971174980).

1213213637968 is a wasteful number, since it uses less digits than its factorization.

1213213637968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180109342 (or 180109336 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 52.

The spelling of 1213213637968 in words is "one trillion, two hundred thirteen billion, two hundred thirteen million, six hundred thirty-seven thousand, nine hundred sixty-eight".