221100001100 has 72 divisors (see below), whose sum is σ = 540288086016. Its totient is φ = 77806440000.

The previous prime is 221100001091. The next prime is 221100001103. The reversal of 221100001100 is 1100001122.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (221100001103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3207836 + ... + 3276035.

Almost surely, 2^221100001100 is an apocalyptic number.

221100001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221100001100 is an abundant number, since it is smaller than the sum of its proper divisors (319188084916).

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

221100001100 is a wasteful number, since it uses less digits than its factorization.

221100001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6483927 (or 6483920 counting only the distinct ones).

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

Adding to 221100001100 its reverse (1100001122), we get a palindrome (222200002222).

The spelling of 221100001100 in words is "two hundred twenty-one billion, one hundred million, one thousand, one hundred".