100111221100 has 144 divisors (see below), whose sum is σ = 243696402432. Its totient is φ = 35380800000.

The previous prime is 100111221073. The next prime is 100111221127. The reversal of 100111221100 is 1122111001.

It is an interprime number because it is at equal distance from previous prime (100111221073) and next prime (100111221127).

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 12218005 + ... + 12226195.

It is an arithmetic number, because the mean of its divisors is an integer number (1692336128).

Almost surely, 2^100111221100 is an apocalyptic number.

100111221100 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 100111221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121848201216).

100111221100 is an abundant number, since it is smaller than the sum of its proper divisors (143585181332).

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

100111221100 is a wasteful number, since it uses less digits than its factorization.

100111221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8528 (or 8521 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 100111221100 its reverse (1122111001), we get a palindrome (101233332101).

The spelling of 100111221100 in words is "one hundred billion, one hundred eleven million, two hundred twenty-one thousand, one hundred".