11102100021 has 6 divisors (see below), whose sum is σ = 16036366710. Its totient is φ = 7401400008.

The previous prime is 11102100017. The next prime is 11102100043. The reversal of 11102100021 is 12000120111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9664856100 + 1437243921 = 98310^2 + 37911^2 .

It is not a de Polignac number, because 11102100021 - 2² = 11102100017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1233566669 = 11102100021 / (1 + 1 + 1 + 0 + 2 + 1 + 0 + 0 + 0 + 2 + 1).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11102099976 and 11102100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11102100001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 616783326 + ... + 616783343.

It is an arithmetic number, because the mean of its divisors is an integer number (2672727785).

Almost surely, 2^11102100021 is an apocalyptic number.

It is an amenable number.

11102100021 is a deficient number, since it is larger than the sum of its proper divisors (4934266689).

11102100021 is a wasteful number, since it uses less digits than its factorization.

11102100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233566675 (or 1233566672 counting only the distinct ones).

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

Adding to 11102100021 its reverse (12000120111), we get a palindrome (23102220132).

The spelling of 11102100021 in words is "eleven billion, one hundred two million, one hundred thousand, twenty-one".