100421200 has 120 divisors (see below), whose sum is σ = 272616480. Its totient is φ = 35212800.

The previous prime is 100421173. The next prime is 100421201. The reversal of 100421200 is 2124001.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100421201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127207 + ... + 127993.

It is an arithmetic number, because the mean of its divisors is an integer number (2271804).

Almost surely, 2^100421200 is an apocalyptic number.

100421200 is a gapful number since it is divisible by the number (10) 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 100421200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136308240).

100421200 is an abundant number, since it is smaller than the sum of its proper divisors (172195280).

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

100421200 is a wasteful number, since it uses less digits than its factorization.

100421200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 100421200 is about 10021.0378704005. The cubic root of 100421200 is about 464.8096496111.

Adding to 100421200 its reverse (2124001), we get a palindrome (102545201).

The spelling of 100421200 in words is "one hundred million, four hundred twenty-one thousand, two hundred".