11000000000021 has 4 divisors (see below), whose sum is σ = 11000110255200. Its totient is φ = 10999889744844.

The previous prime is 10999999999943. The next prime is 11000000000039. The reversal of 11000000000021 is 12000000000011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11000000000021 - 2¹⁸ = 10999999737877 is a prime.

It is a Duffinian number.

11000000000021 is a modest number, since divided by 21 gives 11 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 10999999999924 and 11000000000014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11000000002021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54977801 + ... + 55177518.

It is an arithmetic number, because the mean of its divisors is an integer number (2750027563800).

Almost surely, 2^{11000000000021} is an apocalyptic number.

It is an amenable number.

11000000000021 is a deficient number, since it is larger than the sum of its proper divisors (110255179).

11000000000021 is an equidigital number, since it uses as much as digits as its factorization.

11000000000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110255178.

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

Adding to 11000000000021 its reverse (12000000000011), we get a palindrome (23000000000032).

The spelling of 11000000000021 in words is "eleven trillion, twenty-one", and thus it is an aban number and an uban number.