1213387805636 has 12 divisors (see below), whose sum is σ = 2123491120128. Its totient is φ = 606676057032.

The previous prime is 1213387805599. The next prime is 1213387805659. The reversal of 1213387805636 is 6365087833121.

It is a super-2 number, since 2×1213387805636² (a number of 25 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 4307876 + ... + 4580891.

It is an arithmetic number, because the mean of its divisors is an integer number (176957593344).

Almost surely, 2^{1213387805636} is an apocalyptic number.

It is an amenable number.

1213387805636 is a deficient number, since it is larger than the sum of its proper divisors (910103314492).

1213387805636 is a wasteful number, since it uses less digits than its factorization.

1213387805636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8922898 (or 8922896 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 1213387805636 in words is "one trillion, two hundred thirteen billion, three hundred eighty-seven million, eight hundred five thousand, six hundred thirty-six".