221163900 has 72 divisors (see below), whose sum is σ = 643594224. Its totient is φ = 58636800.

The previous prime is 221163893. The next prime is 221163941. The reversal of 221163900 is 9361122.

It is a super-3 number, since 3×221163900³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

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, 52264 + ... + 56336.

Almost surely, 2^221163900 is an apocalyptic number.

221163900 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 221163900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321797112).

221163900 is an abundant number, since it is smaller than the sum of its proper divisors (422430324).

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

221163900 is a wasteful number, since it uses less digits than its factorization.

221163900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271 (or 4264 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 221163900 is about 14871.5802791768. The cubic root of 221163900 is about 604.7437842300.

The spelling of 221163900 in words is "two hundred twenty-one million, one hundred sixty-three thousand, nine hundred".