221201221100 has 36 divisors (see below), whose sum is σ = 484759213008. Its totient is φ = 87604440000.

The previous prime is 221201221079. The next prime is 221201221117. The reversal of 221201221100 is 1122102122.

221201221100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221201221100² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 10940456 + ... + 10960655.

Almost surely, 2^221201221100 is an apocalyptic number.

221201221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201221100 is an abundant number, since it is smaller than the sum of its proper divisors (263557991908).

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

221201221100 is a wasteful number, since it uses less digits than its factorization.

221201221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21901226 (or 21901219 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221201221100 its reverse (1122102122), we get a palindrome (222323323222).

The spelling of 221201221100 in words is "two hundred twenty-one billion, two hundred one million, two hundred twenty-one thousand, one hundred".