221001001100 has 36 divisors (see below), whose sum is σ = 523169645208. Its totient is φ = 80364000000.

The previous prime is 221001001097. The next prime is 221001001187. The reversal of 221001001100 is 1100100122.

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, 100453901 + ... + 100456100.

Almost surely, 2^221001001100 is an apocalyptic number.

221001001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001001100 is an abundant number, since it is smaller than the sum of its proper divisors (302168644108).

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

221001001100 is a wasteful number, since it uses less digits than its factorization.

221001001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200910026 (or 200910019 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 221001001100 its reverse (1100100122), we get a palindrome (222101101222).

The spelling of 221001001100 in words is "two hundred twenty-one billion, one million, one thousand, one hundred".