421400420 has 96 divisors (see below), whose sum is σ = 1089365760. Its totient is φ = 133632000.

The previous prime is 421400389. The next prime is 421400423. The reversal of 421400420 is 24004124.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (421400423) 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, 138920 + ... + 141920.

It is an arithmetic number, because the mean of its divisors is an integer number (11347560).

Almost surely, 2^421400420 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 421400420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (544682880).

421400420 is an abundant number, since it is smaller than the sum of its proper divisors (667965340).

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

421400420 is a wasteful number, since it uses less digits than its factorization.

421400420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093 (or 3091 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 421400420 is about 20528.0398479738. The cubic root of 421400420 is about 749.7186618858.

Adding to 421400420 its reverse (24004124), we get a palindrome (445404544).

The spelling of 421400420 in words is "four hundred twenty-one million, four hundred thousand, four hundred twenty".