21758887899 has 32 divisors (see below), whose sum is σ = 36882263040. Its totient is φ = 12419536896.

The previous prime is 21758887853. The next prime is 21758887933. The reversal of 21758887899 is 99878885712.

It is not a de Polignac number, because 21758887899 - 2¹⁷ = 21758756827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21758887849) 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 in 31 ways as a sum of consecutive naturals, for example, 102747 + ... + 232539.

It is an arithmetic number, because the mean of its divisors is an integer number (1152570720).

Almost surely, 2^21758887899 is an apocalyptic number.

21758887899 is a deficient number, since it is larger than the sum of its proper divisors (15123375141).

21758887899 is a wasteful number, since it uses less digits than its factorization.

21758887899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130696 (or 130690 counting only the distinct ones).

The product of its digits is 162570240, while the sum is 72.

The spelling of 21758887899 in words is "twenty-one billion, seven hundred fifty-eight million, eight hundred eighty-seven thousand, eight hundred ninety-nine".