221221201100 has 18 divisors (see below), whose sum is σ = 480050006604. Its totient is φ = 88488480400.

The previous prime is 221221201099. The next prime is 221221201133. The reversal of 221221201100 is 1102122122.

221221201100 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 2×221221201100² (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 5 ways as a sum of consecutive naturals, for example, 1106105906 + ... + 1106106105.

Almost surely, 2^221221201100 is an apocalyptic number.

221221201100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221221201100 is an abundant number, since it is smaller than the sum of its proper divisors (258828805504).

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

221221201100 is a wasteful number, since it uses less digits than its factorization.

221221201100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212212025 (or 2212212018 counting only the distinct ones).

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

Adding to 221221201100 its reverse (1102122122), we get a palindrome (222323323222).

The spelling of 221221201100 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, one hundred".