221112011100 has 144 divisors (see below), whose sum is σ = 685609118208. Its totient is φ = 54875208960.

The previous prime is 221112011069. The next prime is 221112011117. The reversal of 221112011100 is 1110211122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 177744 + ... + 688343.

It is an arithmetic number, because the mean of its divisors is an integer number (4761174432).

Almost surely, 2^221112011100 is an apocalyptic number.

221112011100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221112011100 is an abundant number, since it is smaller than the sum of its proper divisors (464497107108).

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

221112011100 is a wasteful number, since it uses less digits than its factorization.

221112011100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866164 (or 866157 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221112011100 its reverse (1110211122), we get a palindrome (222222222222).

The spelling of 221112011100 in words is "two hundred twenty-one billion, one hundred twelve million, eleven thousand, one hundred".