21956546039 has 4 divisors (see below), whose sum is σ = 21960077160. Its totient is φ = 21953014920.

The previous prime is 21956546011. The next prime is 21956546041. The reversal of 21956546039 is 93064565912.

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 21956546039 - 2³² = 17661578743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21956546089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1756217 + ... + 1768674.

It is an arithmetic number, because the mean of its divisors is an integer number (5490019290).

Almost surely, 2^21956546039 is an apocalyptic number.

21956546039 is a deficient number, since it is larger than the sum of its proper divisors (3531121).

21956546039 is an equidigital number, since it uses as much as digits as its factorization.

21956546039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531120.

The product of its (nonzero) digits is 1749600, while the sum is 50.

The spelling of 21956546039 in words is "twenty-one billion, nine hundred fifty-six million, five hundred forty-six thousand, thirty-nine".