1321311561402 has 32 divisors (see below), whose sum is σ = 3179095488000. Its totient is φ = 357648241968.

The previous prime is 1321311561389. The next prime is 1321311561463. The reversal of 1321311561402 is 2041651131231.

It is a self number, because there is not a number n which added to its sum of digits gives 1321311561402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 827888652 + ... + 827890247.

It is an arithmetic number, because the mean of its divisors is an integer number (99346734000).

Almost surely, 2^{1321311561402} is an apocalyptic number.

1321311561402 is an abundant number, since it is smaller than the sum of its proper divisors (1857783926598).

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

1321311561402 is a wasteful number, since it uses less digits than its factorization.

1321311561402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655778930.

The product of its (nonzero) digits is 4320, while the sum is 30.

Adding to 1321311561402 its reverse (2041651131231), we get a palindrome (3362962692633).

The spelling of 1321311561402 in words is "one trillion, three hundred twenty-one billion, three hundred eleven million, five hundred sixty-one thousand, four hundred two".