11001111100021 has 6 divisors (see below), whose sum is σ = 12797210871510. Its totient is φ = 9429523799976.

The previous prime is 11001111100013. The next prime is 11001111100033. The reversal of 11001111100021 is 12000111110011.

It can be written as a sum of positive squares in only one way, i.e., 7641277089796 + 3359834010225 = 2764286^2 + 1832985^2 .

It is not a de Polignac number, because 11001111100021 - 2³ = 11001111100013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11001111099980 and 11001111100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001111100051) 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, 112256235666 + ... + 112256235763.

It is an arithmetic number, because the mean of its divisors is an integer number (2132868478585).

Almost surely, 2^{11001111100021} is an apocalyptic number.

It is an amenable number.

11001111100021 is a deficient number, since it is larger than the sum of its proper divisors (1796099771489).

11001111100021 is an equidigital number, since it uses as much as digits as its factorization.

11001111100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224512471443 (or 224512471436 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 11001111100021 its reverse (12000111110011), we get a palindrome (23001222210032).

The spelling of 11001111100021 in words is "eleven trillion, one billion, one hundred eleven million, one hundred thousand, twenty-one".