1321404304545 has 24 divisors (see below), whose sum is σ = 2466621369576. Its totient is φ = 650537503488.

The previous prime is 1321404304531. The next prime is 1321404304559. The reversal of 1321404304545 is 5454034041231.

1321404304545 is a `hidden beast` number, since 1 + 3 + 2 + 140 + 430 + 45 + 45 = 666.

It is an interprime number because it is at equal distance from previous prime (1321404304531) and next prime (1321404304559).

It can be written as a sum of positive squares in 4 ways, for example, as 1809906849 + 1319594397696 = 42543^2 + 1148736^2 .

It is not a de Polignac number, because 1321404304545 - 2²⁸ = 1321135869089 is a prime.

It is a super-2 number, since 2×1321404304545² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1129404804 + ... + 1129405973.

It is an arithmetic number, because the mean of its divisors is an integer number (102775890399).

Almost surely, 2^{1321404304545} is an apocalyptic number.

1321404304545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321404304545 is a deficient number, since it is larger than the sum of its proper divisors (1145217065031).

1321404304545 is a wasteful number, since it uses less digits than its factorization.

1321404304545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258810801 (or 2258810798 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 1321404304545 its reverse (5454034041231), we get a palindrome (6775438345776).

The spelling of 1321404304545 in words is "one trillion, three hundred twenty-one billion, four hundred four million, three hundred four thousand, five hundred forty-five".