20012333322721 has 2 divisors, whose sum is σ = 20012333322722. Its totient is φ = 20012333322720.

The previous prime is 20012333322689. The next prime is 20012333322809. The reversal of 20012333322721 is 12722333321002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16937430791121 + 3074902531600 = 4115511^2 + 1753540^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012333322721 - 2⁵ = 20012333322689 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012333329721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006166661360 + 10006166661361.

It is an arithmetic number, because the mean of its divisors is an integer number (10006166661361).

Almost surely, 2^{20012333322721} is an apocalyptic number.

It is an amenable number.

20012333322721 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012333322721 is an equidigital number, since it uses as much as digits as its factorization.

20012333322721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 31.

Adding to 20012333322721 its reverse (12722333321002), we get a palindrome (32734666643723).

The spelling of 20012333322721 in words is "twenty trillion, twelve billion, three hundred thirty-three million, three hundred twenty-two thousand, seven hundred twenty-one".