21888866749 has 8 divisors (see below), whose sum is σ = 23181137280. Its totient is φ = 20597117376.

The previous prime is 21888866729. The next prime is 21888866767. The reversal of 21888866749 is 94766888812.

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 21888866749 - 2⁵ = 21888866717 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 (21888866729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42099 + ... + 213424.

It is an arithmetic number, because the mean of its divisors is an integer number (2897642160).

Almost surely, 2^21888866749 is an apocalyptic number.

It is an amenable number.

21888866749 is a deficient number, since it is larger than the sum of its proper divisors (1292270531).

21888866749 is a wasteful number, since it uses less digits than its factorization.

21888866749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260579.

The product of its digits is 74317824, while the sum is 67.

The spelling of 21888866749 in words is "twenty-one billion, eight hundred eighty-eight million, eight hundred sixty-six thousand, seven hundred forty-nine".