20001122000021 has 2 divisors, whose sum is σ = 20001122000022. Its totient is φ = 20001122000020.

The previous prime is 20001121999973. The next prime is 20001122000071. The reversal of 20001122000021 is 12000022110002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16402945503025 + 3598176496996 = 4050055^2 + 1896886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001122000021 - 2²² = 20001117805717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001121999966 and 20001122000011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001122000071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000561000010 + 10000561000011.

It is an arithmetic number, because the mean of its divisors is an integer number (10000561000011).

Almost surely, 2^{20001122000021} is an apocalyptic number.

It is an amenable number.

20001122000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001122000021 is an equidigital number, since it uses as much as digits as its factorization.

20001122000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20001122000021 its reverse (12000022110002), we get a palindrome (32001144110023).

The spelling of 20001122000021 in words is "twenty trillion, one billion, one hundred twenty-two million, twenty-one", and thus it is an aban number.