221330100 has 36 divisors (see below), whose sum is σ = 640382624. Its totient is φ = 59021280.

The previous prime is 221330071. The next prime is 221330119. The reversal of 221330100 is 1033122.

It is a happy number.

221330100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368584 + ... + 369183.

Almost surely, 2^221330100 is an apocalyptic number.

221330100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221330100 is an abundant number, since it is smaller than the sum of its proper divisors (419052524).

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

221330100 is a wasteful number, since it uses less digits than its factorization.

221330100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737784 (or 737777 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 221330100 is about 14877.1670690357. The cubic root of 221330100 is about 604.8952303608.

Adding to 221330100 its reverse (1033122), we get a palindrome (222363222).

The spelling of 221330100 in words is "two hundred twenty-one million, three hundred thirty thousand, one hundred".