11001211212100 has 72 divisors (see below), whose sum is σ = 25283636071848. Its totient is φ = 4140528844800.

The previous prime is 11001211212097. The next prime is 11001211212107. The reversal of 11001211212100 is 121211210011.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 2472089554944 + 8529121657156 = 1572288^2 + 2920466^2 .

It is not an unprimeable number, because it can be changed into a prime (11001211212107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5533384 + ... + 7254016.

It is an arithmetic number, because the mean of its divisors is an integer number (351161612109).

Almost surely, 2^{11001211212100} is an apocalyptic number.

11001211212100 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 11001211212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12641818035924).

11001211212100 is an abundant number, since it is smaller than the sum of its proper divisors (14282424859748).

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

11001211212100 is a wasteful number, since it uses less digits than its factorization.

11001211212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724425 (or 1724418 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11001211212100 its reverse (121211210011), we get a palindrome (11122422422111).

The spelling of 11001211212100 in words is "eleven trillion, one billion, two hundred eleven million, two hundred twelve thousand, one hundred".