221161100 has 36 divisors (see below), whose sum is σ = 500790864. Its totient is φ = 84617280.

The previous prime is 221161097. The next prime is 221161133. The reversal of 221161100 is 1161122.

221161100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 45779 + ... + 50378.

Almost surely, 2^221161100 is an apocalyptic number.

221161100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221161100 is an abundant number, since it is smaller than the sum of its proper divisors (279629764).

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

221161100 is a wasteful number, since it uses less digits than its factorization.

221161100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96194 (or 96187 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 221161100 is about 14871.4861395894. The cubic root of 221161100 is about 604.7412321412.

The spelling of 221161100 in words is "two hundred twenty-one million, one hundred sixty-one thousand, one hundred".