321213404030921 has 2 divisors, whose sum is σ = 321213404030922. Its totient is φ = 321213404030920.

The previous prime is 321213404030917. The next prime is 321213404031029. The reversal of 321213404030921 is 129030404312123.

Together with next prime (321213404031029) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242130871908025 + 79082532122896 = 15560555^2 + 8892836^2 .

It is a cyclic number.

It is not a de Polignac number, because 321213404030921 - 2² = 321213404030917 is a prime.

It is a super-2 number, since 2×321213404030921² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (321213404030521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160606702015460 + 160606702015461.

It is an arithmetic number, because the mean of its divisors is an integer number (160606702015461).

Almost surely, 2^{321213404030921} is an apocalyptic number.

It is an amenable number.

321213404030921 is a deficient number, since it is larger than the sum of its proper divisors (1).

321213404030921 is an equidigital number, since it uses as much as digits as its factorization.

321213404030921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 321213404030921 in words is "three hundred twenty-one trillion, two hundred thirteen billion, four hundred four million, thirty thousand, nine hundred twenty-one".