421778798100 has 216 divisors, whose sum is σ = 1445588726400. Its totient is φ = 102011136000.

The previous prime is 421778798059. The next prime is 421778798101. The reversal of 421778798100 is 1897877124.

421778798100 is a `hidden beast` number, since 421 + 7 + 78 + 79 + 81 + 0 + 0 = 666.

421778798100 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×421778798100² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421778798101) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4217476 + ... + 4316324.

It is an arithmetic number, because the mean of its divisors is an integer number (6692540400).

Almost surely, 2^421778798100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421778798100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (722794363200).

421778798100 is an abundant number, since it is smaller than the sum of its proper divisors (1023809928300).

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

421778798100 is a wasteful number, since it uses less digits than its factorization.

421778798100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99311 (or 99301 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The spelling of 421778798100 in words is "four hundred twenty-one billion, seven hundred seventy-eight million, seven hundred ninety-eight thousand, one hundred".