21299984008 has 32 divisors (see below), whose sum is σ = 40518374400. Its totient is φ = 10496005632.

The previous prime is 21299983993. The next prime is 21299984009. The reversal of 21299984008 is 80048999212.

It is not an unprimeable number, because it can be changed into a prime (21299984009) 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 7 ways as a sum of consecutive naturals, for example, 128041 + ... + 242887.

It is an arithmetic number, because the mean of its divisors is an integer number (1266199200).

Almost surely, 2^21299984008 is an apocalyptic number.

It is an amenable number.

21299984008 is a deficient number, since it is larger than the sum of its proper divisors (19218390392).

21299984008 is a wasteful number, since it uses less digits than its factorization.

21299984008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115189 (or 115185 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 21299984008 in words is "twenty-one billion, two hundred ninety-nine million, nine hundred eighty-four thousand, eight".