1321156634634 has 24 divisors (see below), whose sum is σ = 2875006077060. Its totient is φ = 438462462528.

The previous prime is 1321156634621. The next prime is 1321156634671. The reversal of 1321156634634 is 4364366511231.

1321156634634 is a `hidden beast` number, since 1 + 3 + 2 + 1 + 1 + 5 + 6 + 6 + 3 + 4 + 634 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 919004070609 + 402152564025 = 958647^2 + 634155^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1321156634634.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160252627 + ... + 160260870.

Almost surely, 2^{1321156634634} is an apocalyptic number.

1321156634634 is an abundant number, since it is smaller than the sum of its proper divisors (1553849442426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321156634634 is a wasteful number, since it uses less digits than its factorization.

1321156634634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320513734 (or 320513731 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The spelling of 1321156634634 in words is "one trillion, three hundred twenty-one billion, one hundred fifty-six million, six hundred thirty-four thousand, six hundred thirty-four".