21942045254009 has 2 divisors, whose sum is σ = 21942045254010. Its totient is φ = 21942045254008.

The previous prime is 21942045253993. The next prime is 21942045254053. The reversal of 21942045254009 is 90045254024912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21319200721984 + 622844532025 = 4617272^2 + 789205^2 .

It is a cyclic number.

It is not a de Polignac number, because 21942045254009 - 2⁴ = 21942045253993 is a prime.

It is not a weakly prime, because it can be changed into another prime (21942045254309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10971022627004 + 10971022627005.

It is an arithmetic number, because the mean of its divisors is an integer number (10971022627005).

Almost surely, 2^{21942045254009} is an apocalyptic number.

It is an amenable number.

21942045254009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21942045254009 is an equidigital number, since it uses as much as digits as its factorization.

21942045254009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 21942045254009 in words is "twenty-one trillion, nine hundred forty-two billion, forty-five million, two hundred fifty-four thousand, nine".