421335649073 has 2 divisors, whose sum is σ = 421335649074. Its totient is φ = 421335649072.

The previous prime is 421335649069. The next prime is 421335649093. The reversal of 421335649073 is 370946533124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259455759424 + 161879889649 = 509368^2 + 402343^2 .

It is a cyclic number.

It is not a de Polignac number, because 421335649073 - 2² = 421335649069 is a prime.

It is not a weakly prime, because it can be changed into another prime (421335649013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210667824536 + 210667824537.

It is an arithmetic number, because the mean of its divisors is an integer number (210667824537).

Almost surely, 2^421335649073 is an apocalyptic number.

It is an amenable number.

421335649073 is a deficient number, since it is larger than the sum of its proper divisors (1).

421335649073 is an equidigital number, since it uses as much as digits as its factorization.

421335649073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 47.

The spelling of 421335649073 in words is "four hundred twenty-one billion, three hundred thirty-five million, six hundred forty-nine thousand, seventy-three".