1321365135556 has 24 divisors (see below), whose sum is σ = 2356083132480. Its totient is φ = 648199205472.

The previous prime is 1321365135533. The next prime is 1321365135557. The reversal of 1321365135556 is 6555315631231.

It is a super-3 number, since 3×1321365135556³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321365135557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11330415 + ... + 11446441.

It is an arithmetic number, because the mean of its divisors is an integer number (98170130520).

Almost surely, 2^{1321365135556} is an apocalyptic number.

It is an amenable number.

1321365135556 is a deficient number, since it is larger than the sum of its proper divisors (1034717996924).

1321365135556 is a wasteful number, since it uses less digits than its factorization.

1321365135556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169803 (or 169801 counting only the distinct ones).

The product of its digits is 1215000, while the sum is 46.

The spelling of 1321365135556 in words is "one trillion, three hundred twenty-one billion, three hundred sixty-five million, one hundred thirty-five thousand, five hundred fifty-six".