21554480587 has 4 divisors (see below), whose sum is σ = 21558609496. Its totient is φ = 21550351680.

The previous prime is 21554480533. The next prime is 21554480609. The reversal of 21554480587 is 78508445512.

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 21554480587 - 2⁷ = 21554480459 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 21554480587.

It is not an unprimeable number, because it can be changed into a prime (21554480887) 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, 2056614 + ... + 2067067.

It is an arithmetic number, because the mean of its divisors is an integer number (5389652374).

Almost surely, 2^21554480587 is an apocalyptic number.

21554480587 is a deficient number, since it is larger than the sum of its proper divisors (4128909).

21554480587 is an equidigital number, since it uses as much as digits as its factorization.

21554480587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4128908.

The product of its (nonzero) digits is 1792000, while the sum is 49.

The spelling of 21554480587 in words is "twenty-one billion, five hundred fifty-four million, four hundred eighty thousand, five hundred eighty-seven".