19822972121 has 2 divisors, whose sum is σ = 19822972122. Its totient is φ = 19822972120.

The previous prime is 19822972109. The next prime is 19822972139. The reversal of 19822972121 is 12127922891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19049520400 + 773451721 = 138020^2 + 27811^2 .

It is a cyclic number.

It is not a de Polignac number, because 19822972121 - 2¹⁰ = 19822971097 is a prime.

It is not a weakly prime, because it can be changed into another prime (19822972171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9911486060 + 9911486061.

It is an arithmetic number, because the mean of its divisors is an integer number (9911486061).

Almost surely, 2^19822972121 is an apocalyptic number.

It is an amenable number.

19822972121 is a deficient number, since it is larger than the sum of its proper divisors (1).

19822972121 is an equidigital number, since it uses as much as digits as its factorization.

19822972121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The spelling of 19822972121 in words is "nineteen billion, eight hundred twenty-two million, nine hundred seventy-two thousand, one hundred twenty-one".