1321405054521 has 16 divisors (see below), whose sum is σ = 1771510460160. Its totient is φ = 876126625920.

The previous prime is 1321405054511. The next prime is 1321405054549. The reversal of 1321405054521 is 1254505041231.

It is not a de Polignac number, because 1321405054521 - 2¹⁸ = 1321404792377 is a prime.

It is a super-2 number, since 2×1321405054521² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321405054511) 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 15 ways as a sum of consecutive naturals, for example, 429820 + ... + 1681533.

It is an arithmetic number, because the mean of its divisors is an integer number (110719403760).

Almost surely, 2^{1321405054521} is an apocalyptic number.

It is an amenable number.

1321405054521 is a deficient number, since it is larger than the sum of its proper divisors (450105405639).

1321405054521 is a wasteful number, since it uses less digits than its factorization.

1321405054521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112496.

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 1321405054521 in words is "one trillion, three hundred twenty-one billion, four hundred five million, fifty-four thousand, five hundred twenty-one".