421593644939 has 2 divisors, whose sum is σ = 421593644940. Its totient is φ = 421593644938.

The previous prime is 421593644929. The next prime is 421593645007. The reversal of 421593644939 is 939446395124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421593644939 - 2¹² = 421593640843 is a prime.

It is not a weakly prime, because it can be changed into another prime (421593644929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210796822469 + 210796822470.

It is an arithmetic number, because the mean of its divisors is an integer number (210796822470).

Almost surely, 2^421593644939 is an apocalyptic number.

421593644939 is a deficient number, since it is larger than the sum of its proper divisors (1).

421593644939 is an equidigital number, since it uses as much as digits as its factorization.

421593644939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25194240, while the sum is 59.

The spelling of 421593644939 in words is "four hundred twenty-one billion, five hundred ninety-three million, six hundred forty-four thousand, nine hundred thirty-nine".