20212211161 has 2 divisors, whose sum is σ = 20212211162. Its totient is φ = 20212211160.

The previous prime is 20212211111. The next prime is 20212211177. The reversal of 20212211161 is 16111221202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12559460761 + 7652750400 = 112069^2 + 87480^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212211161 - 2¹⁷ = 20212080089 is a prime.

It is not a weakly prime, because it can be changed into another prime (20212211111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106105580 + 10106105581.

It is an arithmetic number, because the mean of its divisors is an integer number (10106105581).

Almost surely, 2^20212211161 is an apocalyptic number.

It is an amenable number.

20212211161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212211161 is an equidigital number, since it uses as much as digits as its factorization.

20212211161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 20212211161 its reverse (16111221202), we get a palindrome (36323432363).

The spelling of 20212211161 in words is "twenty billion, two hundred twelve million, two hundred eleven thousand, one hundred sixty-one".