221111120210100 has 144 divisors (see below), whose sum is σ = 640249579945920. Its totient is φ = 58916760883200.

The previous prime is 221111120210077. The next prime is 221111120210107. The reversal of 221111120210100 is 1012021111122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221111120210100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111120210107) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6681894555 + ... + 6681927645.

Almost surely, 2^{221111120210100} is an apocalyptic number.

221111120210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221111120210100 is an abundant number, since it is smaller than the sum of its proper divisors (419138459735820).

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

221111120210100 is a wasteful number, since it uses less digits than its factorization.

221111120210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49890 (or 49883 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221111120210100 its reverse (1012021111122), we get a palindrome (222123141321222).

The spelling of 221111120210100 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred twenty million, two hundred ten thousand, one hundred".