21120043799 has 2 divisors, whose sum is σ = 21120043800. Its totient is φ = 21120043798.

The previous prime is 21120043793. The next prime is 21120043831. The reversal of 21120043799 is 99734002112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120043799 - 2²⁰ = 21118995223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120043793) 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, 10560021899 + 10560021900.

It is an arithmetic number, because the mean of its divisors is an integer number (10560021900).

Almost surely, 2^21120043799 is an apocalyptic number.

21120043799 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120043799 is an equidigital number, since it uses as much as digits as its factorization.

21120043799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The spelling of 21120043799 in words is "twenty-one billion, one hundred twenty million, forty-three thousand, seven hundred ninety-nine".