20211100111121 has 2 divisors, whose sum is σ = 20211100111122. Its totient is φ = 20211100111120.

The previous prime is 20211100111079. The next prime is 20211100111141. The reversal of 20211100111121 is 12111100111202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14974732878400 + 5236367232721 = 3869720^2 + 2288311^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211100111121 - 2⁶ = 20211100111057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211100111096 and 20211100111105.

It is not a weakly prime, because it can be changed into another prime (20211100111141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105550055560 + 10105550055561.

It is an arithmetic number, because the mean of its divisors is an integer number (10105550055561).

Almost surely, 2^{20211100111121} is an apocalyptic number.

It is an amenable number.

20211100111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211100111121 is an equidigital number, since it uses as much as digits as its factorization.

20211100111121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20211100111121 its reverse (12111100111202), we get a palindrome (32322200222323).

The spelling of 20211100111121 in words is "twenty trillion, two hundred eleven billion, one hundred million, one hundred eleven thousand, one hundred twenty-one".