20002120021111 has 2 divisors, whose sum is σ = 20002120021112. Its totient is φ = 20002120021110.

The previous prime is 20002120021099. The next prime is 20002120021153. The reversal of 20002120021111 is 11112002120002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20002120021111 - 2⁷ = 20002120020983 is a prime.

It is a super-3 number, since 3×20002120021111³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 20002120021091 and 20002120021100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002120021711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001060010555 + 10001060010556.

It is an arithmetic number, because the mean of its divisors is an integer number (10001060010556).

Almost surely, 2^{20002120021111} is an apocalyptic number.

20002120021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002120021111 is an equidigital number, since it uses as much as digits as its factorization.

20002120021111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20002120021111 its reverse (11112002120002), we get a palindrome (31114122141113).

The spelling of 20002120021111 in words is "twenty trillion, two billion, one hundred twenty million, twenty-one thousand, one hundred eleven".