21033099999 has 24 divisors (see below), whose sum is σ = 31184790000. Its totient is φ = 13652530560.

The previous prime is 21033099977. The next prime is 21033100037. The reversal of 21033099999 is 99999033012.

21033099999 is a `hidden beast` number, since 210 + 330 + 9 + 9 + 9 + 99 = 666.

It is not a de Polignac number, because 21033099999 - 2⁸ = 21033099743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033099299) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127017 + ... + 241245.

It is an arithmetic number, because the mean of its divisors is an integer number (1299366250).

Almost surely, 2^21033099999 is an apocalyptic number.

21033099999 is a deficient number, since it is larger than the sum of its proper divisors (10151690001).

21033099999 is a wasteful number, since it uses less digits than its factorization.

21033099999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114775 (or 114772 counting only the distinct ones).

The product of its (nonzero) digits is 1062882, while the sum is 54.

The spelling of 21033099999 in words is "twenty-one billion, thirty-three million, ninety-nine thousand, nine hundred ninety-nine".