20022221161 has 2 divisors, whose sum is σ = 20022221162. Its totient is φ = 20022221160.

The previous prime is 20022221159. The next prime is 20022221171. The reversal of 20022221161 is 16112222002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13705150761 + 6317070400 = 117069^2 + 79480^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022221161 - 2¹ = 20022221159 is a prime.

Together with 20022221159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20022221171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011110580 + 10011110581.

It is an arithmetic number, because the mean of its divisors is an integer number (10011110581).

Almost surely, 2^20022221161 is an apocalyptic number.

It is an amenable number.

20022221161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20022221161 is an equidigital number, since it uses as much as digits as its factorization.

20022221161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20022221161 its reverse (16112222002), we get a palindrome (36134443163).

The spelling of 20022221161 in words is "twenty billion, twenty-two million, two hundred twenty-one thousand, one hundred sixty-one".