421400220 has 48 divisors (see below), whose sum is σ = 1194869760. Its totient is φ = 110949696.

The previous prime is 421400219. The next prime is 421400237. The reversal of 421400220 is 22004124.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 421400220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39712 + ... + 49191.

It is an arithmetic number, because the mean of its divisors is an integer number (24893120).

Almost surely, 2^421400220 is an apocalyptic number.

It is an amenable number.

421400220 is an abundant number, since it is smaller than the sum of its proper divisors (773469540).

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

421400220 is a wasteful number, since it uses less digits than its factorization.

421400220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88994 (or 88992 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 421400220 is about 20528.0349765875. The cubic root of 421400220 is about 749.7185432783.

Adding to 421400220 its reverse (22004124), we get a palindrome (443404344).

The spelling of 421400220 in words is "four hundred twenty-one million, four hundred thousand, two hundred twenty".