20000121220111 has 2 divisors, whose sum is σ = 20000121220112. Its totient is φ = 20000121220110.

The previous prime is 20000121220109. The next prime is 20000121220187. The reversal of 20000121220111 is 11102212100002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20000121220111 - 2¹ = 20000121220109 is a prime.

Together with 20000121220109, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20000121220091 and 20000121220100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20000121250111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000060610055 + 10000060610056.

It is an arithmetic number, because the mean of its divisors is an integer number (10000060610056).

Almost surely, 2^{20000121220111} is an apocalyptic number.

20000121220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000121220111 is an equidigital number, since it uses as much as digits as its factorization.

20000121220111 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 20000121220111 its reverse (11102212100002), we get a palindrome (31102333320113).

The spelling of 20000121220111 in words is "twenty trillion, one hundred twenty-one million, two hundred twenty thousand, one hundred eleven".