21867902885 has 8 divisors (see below), whose sum is σ = 26881519896. Its totient is φ = 17067631360.

The previous prime is 21867902843. The next prime is 21867902891. The reversal of 21867902885 is 58820976812.

It is a happy number.

It is a Cunningham number, because it is equal to 147878²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1053781444 + 20814121441 = 32462^2 + 144271^2 .

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

It is not a de Polignac number, because 21867902885 - 2⁶ = 21867902821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21867902885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53336144 + ... + 53336553.

It is an arithmetic number, because the mean of its divisors is an integer number (3360189987).

Almost surely, 2^21867902885 is an apocalyptic number.

It is an amenable number.

21867902885 is a deficient number, since it is larger than the sum of its proper divisors (5013617011).

21867902885 is a wasteful number, since it uses less digits than its factorization.

21867902885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106672743.

The product of its (nonzero) digits is 3870720, while the sum is 56.

The spelling of 21867902885 in words is "twenty-one billion, eight hundred sixty-seven million, nine hundred two thousand, eight hundred eighty-five".