20002111000021 has 2 divisors, whose sum is σ = 20002111000022. Its totient is φ = 20002111000020.

The previous prime is 20002110999953. The next prime is 20002111000049. The reversal of 20002111000021 is 12000011120002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17070862256100 + 2931248743921 = 4131690^2 + 1712089^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002111000021 - 2³⁹ = 19452355186133 is a prime.

It is a super-2 number, since 2×20002111000021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20002110999971 and 20002111000007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002111000721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001055500010 + 10001055500011.

It is an arithmetic number, because the mean of its divisors is an integer number (10001055500011).

Almost surely, 2^{20002111000021} is an apocalyptic number.

It is an amenable number.

20002111000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002111000021 is an equidigital number, since it uses as much as digits as its factorization.

20002111000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20002111000021 its reverse (12000011120002), we get a palindrome (32002122120023).

The spelling of 20002111000021 in words is "twenty trillion, two billion, one hundred eleven million, twenty-one", and thus it is an aban number.