21866001667 has 8 divisors (see below), whose sum is σ = 23039675600. Its totient is φ = 20694610944.

The previous prime is 21866001631. The next prime is 21866001671. The reversal of 21866001667 is 76610066812.

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 a de Polignac number, because none of the positive numbers 2^k-21866001667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21866001167) 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, 551118 + ... + 589459.

It is an arithmetic number, because the mean of its divisors is an integer number (2879959450).

Almost surely, 2^21866001667 is an apocalyptic number.

21866001667 is a deficient number, since it is larger than the sum of its proper divisors (1173673933).

21866001667 is a wasteful number, since it uses less digits than its factorization.

21866001667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141605.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 21866001667 in words is "twenty-one billion, eight hundred sixty-six million, one thousand, six hundred sixty-seven".