421221400 has 24 divisors (see below), whose sum is σ = 979340220. Its totient is φ = 168488480.

The previous prime is 421221377. The next prime is 421221403. The reversal of 421221400 is 4122124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421221403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1052854 + ... + 1053253.

Almost surely, 2^421221400 is an apocalyptic number.

421221400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421221400 is an abundant number, since it is smaller than the sum of its proper divisors (558118820).

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

421221400 is a wasteful number, since it uses less digits than its factorization.

421221400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106123 (or 2106114 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 421221400 is about 20523.6790074294. The cubic root of 421221400 is about 749.6124812883.

Adding to 421221400 its reverse (4122124), we get a palindrome (425343524).

The spelling of 421221400 in words is "four hundred twenty-one million, two hundred twenty-one thousand, four hundred".