221220001100 has 108 divisors (see below), whose sum is σ = 577678807440. Its totient is φ = 73231401600.

The previous prime is 221220001027. The next prime is 221220001109. The reversal of 221220001100 is 1100022122.

It is a happy number.

221220001100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221220001109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 636296 + ... + 920495.

Almost surely, 2^221220001100 is an apocalyptic number.

221220001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220001100 is an abundant number, since it is smaller than the sum of its proper divisors (356458806340).

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

221220001100 is a wasteful number, since it uses less digits than its factorization.

221220001100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556848 (or 1556834 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221220001100 its reverse (1100022122), we get a palindrome (222320023222).

The spelling of 221220001100 in words is "two hundred twenty-one billion, two hundred twenty million, one thousand, one hundred".