21399333999 has 8 divisors (see below), whose sum is σ = 28579453440. Its totient is φ = 14242718616.

The previous prime is 21399333973. The next prime is 21399334031. The reversal of 21399333999 is 99933399312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21399333999 - 2¹⁶ = 21399268463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21399333199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5873889 + ... + 5877530.

It is an arithmetic number, because the mean of its divisors is an integer number (3572431680).

Almost surely, 2^21399333999 is an apocalyptic number.

21399333999 is a deficient number, since it is larger than the sum of its proper divisors (7180119441).

21399333999 is a wasteful number, since it uses less digits than its factorization.

21399333999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11752029.

The product of its digits is 9565938, while the sum is 60.

The spelling of 21399333999 in words is "twenty-one billion, three hundred ninety-nine million, three hundred thirty-three thousand, nine hundred ninety-nine".