20211000111161 has 2 divisors, whose sum is σ = 20211000111162. Its totient is φ = 20211000111160.

The previous prime is 20211000110999. The next prime is 20211000111173. The reversal of 20211000111161 is 16111100011202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19224226087936 + 986774023225 = 4384544^2 + 993365^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211000111161 - 2¹⁰ = 20211000110137 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211000114161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105500055580 + 10105500055581.

It is an arithmetic number, because the mean of its divisors is an integer number (10105500055581).

Almost surely, 2^{20211000111161} is an apocalyptic number.

It is an amenable number.

20211000111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211000111161 is an equidigital number, since it uses as much as digits as its factorization.

20211000111161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 20211000111161 its reverse (16111100011202), we get a palindrome (36322100122363).

The spelling of 20211000111161 in words is "twenty trillion, two hundred eleven billion, one hundred eleven thousand, one hundred sixty-one".