21167000887 has 8 divisors (see below), whose sum is σ = 21630410496. Its totient is φ = 20704135032.

The previous prime is 21167000879. The next prime is 21167000923. The reversal of 21167000887 is 78800076112.

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 21167000887 - 2³ = 21167000879 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 (21167000807) 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, 56733 + ... + 213430.

It is an arithmetic number, because the mean of its divisors is an integer number (2703801312).

Almost surely, 2^21167000887 is an apocalyptic number.

21167000887 is a deficient number, since it is larger than the sum of its proper divisors (463409609).

21167000887 is a wasteful number, since it uses less digits than its factorization.

21167000887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271877.

The product of its (nonzero) digits is 37632, while the sum is 40.

Adding to 21167000887 its reverse (78800076112), we get a palindrome (99967076999).

The spelling of 21167000887 in words is "twenty-one billion, one hundred sixty-seven million, eight hundred eighty-seven", and thus it is an aban number.