101221111100 has 72 divisors (see below), whose sum is σ = 231310038960. Its totient is φ = 38340933120.

The previous prime is 101221111093. The next prime is 101221111111. The reversal of 101221111100 is 1111122101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4962122 + ... + 4982478.

It is an arithmetic number, because the mean of its divisors is an integer number (3212639430).

Almost surely, 2^101221111100 is an apocalyptic number.

101221111100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 101221111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115655019480).

101221111100 is an abundant number, since it is smaller than the sum of its proper divisors (130088927860).

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

101221111100 is a wasteful number, since it uses less digits than its factorization.

101221111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23007 (or 23000 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 101221111100 its reverse (1111122101), we get a palindrome (102332233201).

The spelling of 101221111100 in words is "one hundred one billion, two hundred twenty-one million, one hundred eleven thousand, one hundred".