20222161 has 2 divisors, whose sum is σ = 20222162. Its totient is φ = 20222160.

The previous prime is 20222123. The next prime is 20222179. The reversal of 20222161 is 16122202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 3779136 = 4055^2 + 1944^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222161 - 2²³ = 11833553 is a prime.

It is not a weakly prime, because it can be changed into another prime (20222101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111080 + 10111081.

It is an arithmetic number, because the mean of its divisors is an integer number (10111081).

Almost surely, 2^20222161 is an apocalyptic number.

It is an amenable number.

20222161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20222161 is an equidigital number, since it uses as much as digits as its factorization.

20222161 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 16.

The square root of 20222161 is about 4496.9057139326. The cubic root of 20222161 is about 272.4431259135.

Adding to 20222161 its reverse (16122202), we get a palindrome (36344363).

The spelling of 20222161 in words is "twenty million, two hundred twenty-two thousand, one hundred sixty-one".