321889502809621 has 2 divisors, whose sum is σ = 321889502809622. Its totient is φ = 321889502809620.

The previous prime is 321889502809597. The next prime is 321889502809687. The reversal of 321889502809621 is 126908205988123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191364338902500 + 130525163907121 = 13833450^2 + 11424761^2 .

It is a cyclic number.

It is not a de Polignac number, because 321889502809621 - 2²³ = 321889494421013 is a prime.

It is a super-2 number, since 2×321889502809621² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321889502809691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160944751404810 + 160944751404811.

It is an arithmetic number, because the mean of its divisors is an integer number (160944751404811).

Almost surely, 2^{321889502809621} is an apocalyptic number.

It is an amenable number.

321889502809621 is a deficient number, since it is larger than the sum of its proper divisors (1).

321889502809621 is an equidigital number, since it uses as much as digits as its factorization.

321889502809621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29859840, while the sum is 64.

The spelling of 321889502809621 in words is "three hundred twenty-one trillion, eight hundred eighty-nine billion, five hundred two million, eight hundred nine thousand, six hundred twenty-one".