21068599231 has 4 divisors (see below), whose sum is σ = 21088309000. Its totient is φ = 21048889464.

The previous prime is 21068599199. The next prime is 21068599241. The reversal of 21068599231 is 13299586012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21068599231 - 2⁵ = 21068599199 is a prime.

It is a super-2 number, since 2×21068599231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21068599241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9853281 + ... + 9855418.

It is an arithmetic number, because the mean of its divisors is an integer number (5272077250).

Almost surely, 2^21068599231 is an apocalyptic number.

21068599231 is a deficient number, since it is larger than the sum of its proper divisors (19709769).

21068599231 is a wasteful number, since it uses less digits than its factorization.

21068599231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19709768.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 21068599231 in words is "twenty-one billion, sixty-eight million, five hundred ninety-nine thousand, two hundred thirty-one".