21875210647 has 8 divisors (see below), whose sum is σ = 22593136896. Its totient is φ = 21166793592.

The previous prime is 21875210629. The next prime is 21875210681. The reversal of 21875210647 is 74601257812.

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 21875210647 - 2¹⁵ = 21875177879 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21875210347) 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, 2372623 + ... + 2381824.

It is an arithmetic number, because the mean of its divisors is an integer number (2824142112).

Almost surely, 2^21875210647 is an apocalyptic number.

21875210647 is a deficient number, since it is larger than the sum of its proper divisors (717926249).

21875210647 is a wasteful number, since it uses less digits than its factorization.

21875210647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4754597.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 21875210647 in words is "twenty-one billion, eight hundred seventy-five million, two hundred ten thousand, six hundred forty-seven".