1321405035121 has 2 divisors, whose sum is σ = 1321405035122. Its totient is φ = 1321405035120.

The previous prime is 1321405035103. The next prime is 1321405035131. The reversal of 1321405035121 is 1215305041231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1154378336400 + 167026698721 = 1074420^2 + 408689^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321405035121 - 2¹¹ = 1321405033073 is a prime.

It is a super-2 number, since 2×1321405035121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321405035121.

It is not a weakly prime, because it can be changed into another prime (1321405035131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660702517560 + 660702517561.

It is an arithmetic number, because the mean of its divisors is an integer number (660702517561).

Almost surely, 2^{1321405035121} is an apocalyptic number.

It is an amenable number.

1321405035121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321405035121 is an equidigital number, since it uses as much as digits as its factorization.

1321405035121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 1321405035121 in words is "one trillion, three hundred twenty-one billion, four hundred five million, thirty-five thousand, one hundred twenty-one".