321405249989 has 2 divisors, whose sum is σ = 321405249990. Its totient is φ = 321405249988.

The previous prime is 321405249901. The next prime is 321405250031. The reversal of 321405249989 is 989942504123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224585949025 + 96819300964 = 473905^2 + 311158^2 .

It is a cyclic number.

It is not a de Polignac number, because 321405249989 - 2⁸ = 321405249733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321405249889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160702624994 + 160702624995.

It is an arithmetic number, because the mean of its divisors is an integer number (160702624995).

Almost surely, 2^321405249989 is an apocalyptic number.

It is an amenable number.

321405249989 is a deficient number, since it is larger than the sum of its proper divisors (1).

321405249989 is an equidigital number, since it uses as much as digits as its factorization.

321405249989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 321405249989 in words is "three hundred twenty-one billion, four hundred five million, two hundred forty-nine thousand, nine hundred eighty-nine".