111220010100 has 108 divisors (see below), whose sum is σ = 350135918860. Its totient is φ = 29529100800.

The previous prime is 111220010017. The next prime is 111220010113. The reversal of 111220010100 is 1010022111.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3776348304 + 107443661796 = 61452^2 + 327786^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 63721 + ... + 475920.

Almost surely, 2^111220010100 is an apocalyptic number.

111220010100 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 111220010100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175067959430).

111220010100 is an abundant number, since it is smaller than the sum of its proper divisors (238915908760).

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

111220010100 is a wasteful number, since it uses less digits than its factorization.

111220010100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539890 (or 539880 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 111220010100 its reverse (1010022111), we get a palindrome (112230032211).

The spelling of 111220010100 in words is "one hundred eleven billion, two hundred twenty million, ten thousand, one hundred".