21542030555 has 4 divisors (see below), whose sum is σ = 25850436672. Its totient is φ = 17233624440.

The previous prime is 21542030537. The next prime is 21542030561. The reversal of 21542030555 is 55503024512.

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

It is not a de Polignac number, because 21542030555 - 2⁶ = 21542030491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2154203051 + ... + 2154203060.

It is an arithmetic number, because the mean of its divisors is an integer number (6462609168).

Almost surely, 2^21542030555 is an apocalyptic number.

21542030555 is a deficient number, since it is larger than the sum of its proper divisors (4308406117).

21542030555 is an equidigital number, since it uses as much as digits as its factorization.

21542030555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4308406116.

The product of its (nonzero) digits is 30000, while the sum is 32.

The spelling of 21542030555 in words is "twenty-one billion, five hundred forty-two million, thirty thousand, five hundred fifty-five".