321353553121 has 2 divisors, whose sum is σ = 321353553122. Its totient is φ = 321353553120.

The previous prime is 321353553107. The next prime is 321353553197. The reversal of 321353553121 is 121355353123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208336560721 + 113016992400 = 456439^2 + 336180^2 .

It is a cyclic number.

It is not a de Polignac number, because 321353553121 - 2¹⁵ = 321353520353 is a prime.

It is a super-2 number, since 2×321353553121² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (321353553721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160676776560 + 160676776561.

It is an arithmetic number, because the mean of its divisors is an integer number (160676776561).

Almost surely, 2^321353553121 is an apocalyptic number.

It is an amenable number.

321353553121 is a deficient number, since it is larger than the sum of its proper divisors (1).

321353553121 is an equidigital number, since it uses as much as digits as its factorization.

321353553121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 34.

The spelling of 321353553121 in words is "three hundred twenty-one billion, three hundred fifty-three million, five hundred fifty-three thousand, one hundred twenty-one".