1321405466643 has 32 divisors (see below), whose sum is σ = 1959512268800. Its totient is φ = 880093900800.

The previous prime is 1321405466611. The next prime is 1321405466699. The reversal of 1321405466643 is 3466645041231.

It is not a de Polignac number, because 1321405466643 - 2⁵ = 1321405466611 is a prime.

It is a super-2 number, since 2×1321405466643² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321405466243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172031763 + ... + 172039443.

It is an arithmetic number, because the mean of its divisors is an integer number (61234758400).

Almost surely, 2^{1321405466643} is an apocalyptic number.

1321405466643 is a deficient number, since it is larger than the sum of its proper divisors (638106802157).

1321405466643 is a wasteful number, since it uses less digits than its factorization.

1321405466643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12960 (or 12954 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 1321405466643 in words is "one trillion, three hundred twenty-one billion, four hundred five million, four hundred sixty-six thousand, six hundred forty-three".