21975809273 has 8 divisors (see below), whose sum is σ = 23977337376. Its totient is φ = 19974902400.

The previous prime is 21975809269. The next prime is 21975809351. The reversal of 21975809273 is 37290857912.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21975809273 - 2² = 21975809269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21975809173) 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, 79736 + ... + 224297.

It is an arithmetic number, because the mean of its divisors is an integer number (2997167172).

Almost surely, 2^21975809273 is an apocalyptic number.

It is an amenable number.

21975809273 is a deficient number, since it is larger than the sum of its proper divisors (2001528103).

21975809273 is a wasteful number, since it uses less digits than its factorization.

21975809273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310615.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The spelling of 21975809273 in words is "twenty-one billion, nine hundred seventy-five million, eight hundred nine thousand, two hundred seventy-three".