21999576899 has 2 divisors, whose sum is σ = 21999576900. Its totient is φ = 21999576898.

The previous prime is 21999576887. The next prime is 21999576917. The reversal of 21999576899 is 99867599912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21999576899 - 2¹⁶ = 21999511363 is a prime.

It is not a weakly prime, because it can be changed into another prime (21999576799) 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, 10999788449 + 10999788450.

It is an arithmetic number, because the mean of its divisors is an integer number (10999788450).

Almost surely, 2^21999576899 is an apocalyptic number.

21999576899 is a deficient number, since it is larger than the sum of its proper divisors (1).

21999576899 is an equidigital number, since it uses as much as digits as its factorization.

21999576899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 198404640, while the sum is 74.

The spelling of 21999576899 in words is "twenty-one billion, nine hundred ninety-nine million, five hundred seventy-six thousand, eight hundred ninety-nine".