21222021019993 has 2 divisors, whose sum is σ = 21222021019994. Its totient is φ = 21222021019992.

The previous prime is 21222021019981. The next prime is 21222021020111. The reversal of 21222021019993 is 39991012022212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18835530560064 + 2386490459929 = 4339992^2 + 1544827^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222021019993 - 2⁵ = 21222021019961 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222021019933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611010509996 + 10611010509997.

It is an arithmetic number, because the mean of its divisors is an integer number (10611010509997).

Almost surely, 2^{21222021019993} is an apocalyptic number.

It is an amenable number.

21222021019993 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222021019993 is an equidigital number, since it uses as much as digits as its factorization.

21222021019993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 21222021019993 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, nineteen thousand, nine hundred ninety-three".