21311230939 has 8 divisors (see below), whose sum is σ = 21361451328. Its totient is φ = 21261039240.

The previous prime is 21311230909. The next prime is 21311230973. The reversal of 21311230939 is 93903211312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21311230939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311230909) 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 7 ways as a sum of consecutive naturals, for example, 2345884 + ... + 2354950.

It is an arithmetic number, because the mean of its divisors is an integer number (2670181416).

Almost surely, 2^21311230939 is an apocalyptic number.

21311230939 is a deficient number, since it is larger than the sum of its proper divisors (50220389).

21311230939 is an equidigital number, since it uses as much as digits as its factorization.

21311230939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14345.

The product of its (nonzero) digits is 8748, while the sum is 34.

The spelling of 21311230939 in words is "twenty-one billion, three hundred eleven million, two hundred thirty thousand, nine hundred thirty-nine".