221371100 has 18 divisors (see below), whose sum is σ = 480375504. Its totient is φ = 88548400.

The previous prime is 221371091. The next prime is 221371141. The reversal of 221371100 is 1173122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1106756 + ... + 1106955.

It is an arithmetic number, because the mean of its divisors is an integer number (26687528).

Almost surely, 2^221371100 is an apocalyptic number.

221371100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221371100 is an abundant number, since it is smaller than the sum of its proper divisors (259004404).

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

221371100 is a wasteful number, since it uses less digits than its factorization.

221371100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213725 (or 2213718 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 221371100 is about 14878.5449557408. The cubic root of 221371100 is about 604.9325790589.

The spelling of 221371100 in words is "two hundred twenty-one million, three hundred seventy-one thousand, one hundred".