421352820 has 384 divisors, whose sum is σ = 1625702400. Its totient is φ = 88418304.

The previous prime is 421352783. The next prime is 421352831. The reversal of 421352820 is 28253124.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5076499 + ... + 5076581.

It is an arithmetic number, because the mean of its divisors is an integer number (4233600).

Almost surely, 2^421352820 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 421352820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812851200).

421352820 is an abundant number, since it is smaller than the sum of its proper divisors (1204349580).

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

421352820 is a wasteful number, since it uses less digits than its factorization.

421352820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 421352820 is about 20526.8804254324. The cubic root of 421352820 is about 749.6904322413.

The spelling of 421352820 in words is "four hundred twenty-one million, three hundred fifty-two thousand, eight hundred twenty".