20120320220081 has 2 divisors, whose sum is σ = 20120320220082. Its totient is φ = 20120320220080.

The previous prime is 20120320219973. The next prime is 20120320220129. The reversal of 20120320220081 is 18002202302102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20024873207056 + 95447013025 = 4474916^2 + 308945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120320220081 is a prime.

It is a super-2 number, since 2×20120320220081² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20120320220381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060160110040 + 10060160110041.

It is an arithmetic number, because the mean of its divisors is an integer number (10060160110041).

Almost surely, 2^{20120320220081} is an apocalyptic number.

It is an amenable number.

20120320220081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120320220081 is an equidigital number, since it uses as much as digits as its factorization.

20120320220081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 20120320220081 its reverse (18002202302102), we get a palindrome (38122522522183).

The spelling of 20120320220081 in words is "twenty trillion, one hundred twenty billion, three hundred twenty million, two hundred twenty thousand, eighty-one".