421099320 has 128 divisors (see below), whose sum is σ = 1300147200. Its totient is φ = 109057536.

The previous prime is 421099297. The next prime is 421099321. The reversal of 421099320 is 23990124.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421099321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1110891 + ... + 1111269.

It is an arithmetic number, because the mean of its divisors is an integer number (10157400).

Almost surely, 2^421099320 is an apocalyptic number.

421099320 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 421099320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (650073600).

421099320 is an abundant number, since it is smaller than the sum of its proper divisors (879047880).

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

421099320 is a wasteful number, since it uses less digits than its factorization.

421099320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 421099320 is about 20520.7046662633. The cubic root of 421099320 is about 749.5400557705.

The spelling of 421099320 in words is "four hundred twenty-one million, ninety-nine thousand, three hundred twenty".