201421100 has 72 divisors (see below), whose sum is σ = 467470080. Its totient is φ = 75064320.

The previous prime is 201421093. The next prime is 201421123. The reversal of 201421100 is 1124102.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184757 + ... + 185843.

It is an arithmetic number, because the mean of its divisors is an integer number (6492640).

Almost surely, 2^201421100 is an apocalyptic number.

201421100 is a gapful number since it is divisible by the number (20) 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 201421100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233735040).

201421100 is an abundant number, since it is smaller than the sum of its proper divisors (266048980).

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

201421100 is a wasteful number, since it uses less digits than its factorization.

201421100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 201421100 is about 14192.2901605062. The cubic root of 201421100 is about 586.1853871080.

Adding to 201421100 its reverse (1124102), we get a palindrome (202545202).

The spelling of 201421100 in words is "two hundred one million, four hundred twenty-one thousand, one hundred".