421218833246623 has 2 divisors, whose sum is σ = 421218833246624. Its totient is φ = 421218833246622.

The previous prime is 421218833246621. The next prime is 421218833246681. The reversal of 421218833246623 is 326642338812124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421218833246623 - 2¹ = 421218833246621 is a prime.

Together with 421218833246621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421218833246621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210609416623311 + 210609416623312.

It is an arithmetic number, because the mean of its divisors is an integer number (210609416623312).

Almost surely, 2^{421218833246623} is an apocalyptic number.

421218833246623 is a deficient number, since it is larger than the sum of its proper divisors (1).

421218833246623 is an equidigital number, since it uses as much as digits as its factorization.

421218833246623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15925248, while the sum is 55.

The spelling of 421218833246623 in words is "four hundred twenty-one trillion, two hundred eighteen billion, eight hundred thirty-three million, two hundred forty-six thousand, six hundred twenty-three".