421806856368 has 160 divisors (see below), whose sum is σ = 1138977100800. Its totient is φ = 134401252608.

The previous prime is 421806856349. The next prime is 421806856417. The reversal of 421806856368 is 863658608124.

It is a super-3 number, since 3×421806856368³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27635523 + ... + 27650781.

It is an arithmetic number, because the mean of its divisors is an integer number (7118606880).

Almost surely, 2^421806856368 is an apocalyptic number.

421806856368 is a gapful number since it is divisible by the number (48) 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 421806856368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (569488550400).

421806856368 is an abundant number, since it is smaller than the sum of its proper divisors (717170244432).

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

421806856368 is a wasteful number, since it uses less digits than its factorization.

421806856368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15599 (or 15593 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 57.

The spelling of 421806856368 in words is "four hundred twenty-one billion, eight hundred six million, eight hundred fifty-six thousand, three hundred sixty-eight".