421218833246639 has 4 divisors (see below), whose sum is σ = 421218923545056. Its totient is φ = 421218742948224.

The previous prime is 421218833246623. The next prime is 421218833246681. The reversal of 421218833246639 is 936642338812124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421218833246639 - 2⁴ = 421218833246623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421218833248639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37747634 + ... + 47616399.

It is an arithmetic number, because the mean of its divisors is an integer number (105304730886264).

Almost surely, 2^{421218833246639} is an apocalyptic number.

421218833246639 is a deficient number, since it is larger than the sum of its proper divisors (90298417).

421218833246639 is an equidigital number, since it uses as much as digits as its factorization.

421218833246639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90298416.

The product of its digits is 71663616, while the sum is 62.

The spelling of 421218833246639 in words is "four hundred twenty-one trillion, two hundred eighteen billion, eight hundred thirty-three million, two hundred forty-six thousand, six hundred thirty-nine".