11321000000021 has 2 divisors, whose sum is σ = 11321000000022. Its totient is φ = 11321000000020.

The previous prime is 11321000000017. The next prime is 11321000000029. The reversal of 11321000000021 is 12000000012311.

11321000000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8270720284996 + 3050279715025 = 2875886^2 + 1746505^2 .

It is a cyclic number.

It is not a de Polignac number, because 11321000000021 - 2² = 11321000000017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11320999999939 and 11321000000011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11321000000029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5660500000010 + 5660500000011.

It is an arithmetic number, because the mean of its divisors is an integer number (5660500000011).

Almost surely, 2^{11321000000021} is an apocalyptic number.

It is an amenable number.

11321000000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11321000000021 is an equidigital number, since it uses as much as digits as its factorization.

11321000000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 11321000000021 its reverse (12000000012311), we get a palindrome (23321000012332).

The spelling of 11321000000021 in words is "eleven trillion, three hundred twenty-one billion, twenty-one", and thus it is an aban number.