1321539261121 has 16 divisors (see below), whose sum is σ = 1370397963600. Its totient is φ = 1272903303168.

The previous prime is 1321539261109. The next prime is 1321539261131. The reversal of 1321539261121 is 1211629351231.

It can be written as a sum of positive squares in 8 ways, for example, as 38156152896 + 1283383108225 = 195336^2 + 1132865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321539261121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321539261101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21613825 + ... + 21674881.

It is an arithmetic number, because the mean of its divisors is an integer number (85649872725).

Almost surely, 2^{1321539261121} is an apocalyptic number.

It is an amenable number.

1321539261121 is a deficient number, since it is larger than the sum of its proper divisors (48858702479).

1321539261121 is a wasteful number, since it uses less digits than its factorization.

1321539261121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62868.

The product of its digits is 19440, while the sum is 37.

The spelling of 1321539261121 in words is "one trillion, three hundred twenty-one billion, five hundred thirty-nine million, two hundred sixty-one thousand, one hundred twenty-one".