321201153122921 has 2 divisors, whose sum is σ = 321201153122922. Its totient is φ = 321201153122920.

The previous prime is 321201153122903. The next prime is 321201153122929. The reversal of 321201153122921 is 129221351102123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188393852240896 + 132807300882025 = 13725664^2 + 11524205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321201153122921 is a prime.

It is not a weakly prime, because it can be changed into another prime (321201153122929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160600576561460 + 160600576561461.

It is an arithmetic number, because the mean of its divisors is an integer number (160600576561461).

Almost surely, 2^{321201153122921} is an apocalyptic number.

It is an amenable number.

321201153122921 is a deficient number, since it is larger than the sum of its proper divisors (1).

321201153122921 is an equidigital number, since it uses as much as digits as its factorization.

321201153122921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 321201153122921 in words is "three hundred twenty-one trillion, two hundred one billion, one hundred fifty-three million, one hundred twenty-two thousand, nine hundred twenty-one".