20321222170061 has 2 divisors, whose sum is σ = 20321222170062. Its totient is φ = 20321222170060.

The previous prime is 20321222170057. The next prime is 20321222170129. The reversal of 20321222170061 is 16007122212302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18154714897225 + 2166507272836 = 4260835^2 + 1471906^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321222170061 - 2² = 20321222170057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321222170861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160611085030 + 10160611085031.

It is an arithmetic number, because the mean of its divisors is an integer number (10160611085031).

Almost surely, 2^{20321222170061} is an apocalyptic number.

It is an amenable number.

20321222170061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321222170061 is an equidigital number, since it uses as much as digits as its factorization.

20321222170061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

Adding to 20321222170061 its reverse (16007122212302), we get a palindrome (36328344382363).

The spelling of 20321222170061 in words is "twenty trillion, three hundred twenty-one billion, two hundred twenty-two million, one hundred seventy thousand, sixty-one".