1321431055556 has 24 divisors (see below), whose sum is σ = 2434252500960. Its totient is φ = 625931409600.

The previous prime is 1321431055517. The next prime is 1321431055577. The reversal of 1321431055556 is 6555501341231.

It is an unprimeable number.

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, 8456696 + ... + 8611536.

It is an arithmetic number, because the mean of its divisors is an integer number (101427187540).

Almost surely, 2^{1321431055556} is an apocalyptic number.

It is an amenable number.

1321431055556 is a deficient number, since it is larger than the sum of its proper divisors (1112821445404).

1321431055556 is a wasteful number, since it uses less digits than its factorization.

1321431055556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267155 (or 267153 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 41.

Adding to 1321431055556 its reverse (6555501341231), we get a palindrome (7876932396787).

The spelling of 1321431055556 in words is "one trillion, three hundred twenty-one billion, four hundred thirty-one million, fifty-five thousand, five hundred fifty-six".