21950547799 has 2 divisors, whose sum is σ = 21950547800. Its totient is φ = 21950547798.

The previous prime is 21950547769. The next prime is 21950547809. The reversal of 21950547799 is 99774505912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21950547799 - 2²⁷ = 21816330071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21950547709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10975273899 + 10975273900.

It is an arithmetic number, because the mean of its divisors is an integer number (10975273900).

Almost surely, 2^21950547799 is an apocalyptic number.

21950547799 is a deficient number, since it is larger than the sum of its proper divisors (1).

21950547799 is an equidigital number, since it uses as much as digits as its factorization.

21950547799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7144200, while the sum is 58.

The spelling of 21950547799 in words is "twenty-one billion, nine hundred fifty million, five hundred forty-seven thousand, seven hundred ninety-nine".