421218833246640 has 480 divisors, whose sum is σ = 1662009723069696. Its totient is φ = 94252523120640.

The previous prime is 421218833246623. The next prime is 421218833246681. The reversal of 421218833246640 is 46642338812124.

It is a happy number.

421218833246640 is a `hidden beast` number, since 4 + 2 + 1 + 218 + 8 + 3 + 324 + 66 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1654131007 + ... + 1654385633.

Almost surely, 2^{421218833246640} is an apocalyptic number.

421218833246640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421218833246640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831004861534848).

421218833246640 is an abundant number, since it is smaller than the sum of its proper divisors (1240790889823056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421218833246640 is a wasteful number, since it uses less digits than its factorization.

421218833246640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270737 (or 270728 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 54.

The spelling of 421218833246640 in words is "four hundred twenty-one trillion, two hundred eighteen billion, eight hundred thirty-three million, two hundred forty-six thousand, six hundred forty".