21304239999 has 8 divisors (see below), whose sum is σ = 32463603840. Its totient is φ = 12173851416.

The previous prime is 21304239889. The next prime is 21304240007. The reversal of 21304239999 is 99993240312.

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 21304239999 - 2¹¹ = 21304237951 is a prime.

It is a super-3 number, since 3×21304239999³ (a number of 32 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304239799) 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, 507243789 + ... + 507243830.

It is an arithmetic number, because the mean of its divisors is an integer number (4057950480).

Almost surely, 2^21304239999 is an apocalyptic number.

21304239999 is a deficient number, since it is larger than the sum of its proper divisors (11159363841).

21304239999 is a wasteful number, since it uses less digits than its factorization.

21304239999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014487629.

The product of its (nonzero) digits is 944784, while the sum is 51.

The spelling of 21304239999 in words is "twenty-one billion, three hundred four million, two hundred thirty-nine thousand, nine hundred ninety-nine".