21550276087 has 4 divisors (see below), whose sum is σ = 21584429296. Its totient is φ = 21516122880.

The previous prime is 21550276081. The next prime is 21550276091. The reversal of 21550276087 is 78067205512.

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

It is a cyclic number.

It is not a de Polignac number, because 21550276087 - 2³ = 21550276079 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 (21550276081) 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, 17075658 + ... + 17076919.

It is an arithmetic number, because the mean of its divisors is an integer number (5396107324).

Almost surely, 2^21550276087 is an apocalyptic number.

21550276087 is a deficient number, since it is larger than the sum of its proper divisors (34153209).

21550276087 is an equidigital number, since it uses as much as digits as its factorization.

21550276087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34153208.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 21550276087 in words is "twenty-one billion, five hundred fifty million, two hundred seventy-six thousand, eighty-seven".