1100020100 has 54 divisors (see below), whose sum is σ = 2409157002. Its totient is φ = 435968000.

The previous prime is 1100020099. The next prime is 1100020127. The reversal of 1100020100 is 10200011.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 238949764 + 861070336 = 15458^2 + 29344^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1715780 + ... + 1716420.

Almost surely, 2^1100020100 is an apocalyptic number.

1100020100 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 1100020100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1204578501).

1100020100 is an abundant number, since it is smaller than the sum of its proper divisors (1309136902).

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

1100020100 is a wasteful number, since it uses less digits than its factorization.

1100020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 1100020100 is about 33166.5509210711. The cubic root of 1100020100 is about 1032.2864029424.

Adding to 1100020100 its reverse (10200011), we get a palindrome (1110220111).

The spelling of 1100020100 in words is "one billion, one hundred million, twenty thousand, one hundred".