221212101100 has 36 divisors (see below), whose sum is σ = 491738323608. Its totient is φ = 86326672000.

The previous prime is 221212101079. The next prime is 221212101101. The reversal of 221212101100 is 1101212122.

It is not an unprimeable number, because it can be changed into a prime (221212101101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26972986 + ... + 26981185.

It is an arithmetic number, because the mean of its divisors is an integer number (13659397878).

Almost surely, 2^221212101100 is an apocalyptic number.

221212101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212101100 is an abundant number, since it is smaller than the sum of its proper divisors (270526222508).

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

221212101100 is a wasteful number, since it uses less digits than its factorization.

221212101100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53954226 (or 53954219 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221212101100 its reverse (1101212122), we get a palindrome (222313313222).

The spelling of 221212101100 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred one thousand, one hundred".