21888673807 has 32 divisors (see below), whose sum is σ = 29692099584. Its totient is φ = 15581721600.

The previous prime is 21888673753. The next prime is 21888673811. The reversal of 21888673807 is 70837688812.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21888673807 is a prime.

It is a super-2 number, since 2×21888673807² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21888673837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15619 + ... + 209812.

It is an arithmetic number, because the mean of its divisors is an integer number (927878112).

Almost surely, 2^21888673807 is an apocalyptic number.

21888673807 is a deficient number, since it is larger than the sum of its proper divisors (7803425777).

21888673807 is a wasteful number, since it uses less digits than its factorization.

21888673807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225559.

The product of its (nonzero) digits is 7225344, while the sum is 58.

The spelling of 21888673807 in words is "twenty-one billion, eight hundred eighty-eight million, six hundred seventy-three thousand, eight hundred seven".