21000229999 has 16 divisors (see below), whose sum is σ = 25422486336. Its totient is φ = 16934400000.

The previous prime is 21000229993. The next prime is 21000230003. The reversal of 21000229999 is 99992200012.

It is not a de Polignac number, because 21000229999 - 2¹¹ = 21000227951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000229993) 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 15 ways as a sum of consecutive naturals, for example, 264999 + ... + 334999.

It is an arithmetic number, because the mean of its divisors is an integer number (1588905396).

Almost surely, 2^21000229999 is an apocalyptic number.

21000229999 is a deficient number, since it is larger than the sum of its proper divisors (4422256337).

21000229999 is a wasteful number, since it uses less digits than its factorization.

21000229999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72546.

The product of its (nonzero) digits is 52488, while the sum is 43.

The spelling of 21000229999 in words is "twenty-one billion, two hundred twenty-nine thousand, nine hundred ninety-nine".