21896072839 has 4 divisors (see below), whose sum is σ = 21981271824. Its totient is φ = 21810873856.

The previous prime is 21896072833. The next prime is 21896072851. The reversal of 21896072839 is 93827069812.

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 21896072839 - 2³ = 21896072831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21896072839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21896072831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42599107 + ... + 42599620.

It is an arithmetic number, because the mean of its divisors is an integer number (5495317956).

Almost surely, 2^21896072839 is an apocalyptic number.

21896072839 is a deficient number, since it is larger than the sum of its proper divisors (85198985).

21896072839 is an equidigital number, since it uses as much as digits as its factorization.

21896072839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85198984.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 21896072839 in words is "twenty-one billion, eight hundred ninety-six million, seventy-two thousand, eight hundred thirty-nine".