21804376087 has 4 divisors (see below), whose sum is σ = 23481635800. Its totient is φ = 20127116376.

The previous prime is 21804376081. The next prime is 21804376093. The reversal of 21804376087 is 78067340812.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21804376081) and next prime (21804376093).

It is a cyclic number.

It is not a de Polignac number, because 21804376087 - 2²⁷ = 21670158359 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 (21804376081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838629837 + ... + 838629862.

It is an arithmetic number, because the mean of its divisors is an integer number (5870408950).

Almost surely, 2^21804376087 is an apocalyptic number.

21804376087 is a deficient number, since it is larger than the sum of its proper divisors (1677259713).

21804376087 is a wasteful number, since it uses less digits than its factorization.

21804376087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677259712.

The product of its (nonzero) digits is 451584, while the sum is 46.

The spelling of 21804376087 in words is "twenty-one billion, eight hundred four million, three hundred seventy-six thousand, eighty-seven".