21554445512 has 64 divisors (see below), whose sum is σ = 41385738240. Its totient is φ = 10522408000.

The previous prime is 21554445511. The next prime is 21554445527.

21554445512 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21554445511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18726137 + ... + 18727287.

It is an arithmetic number, because the mean of its divisors is an integer number (646652160).

Almost surely, 2^21554445512 is an apocalyptic number.

It is an amenable number.

21554445512 is a deficient number, since it is larger than the sum of its proper divisors (19831292728).

21554445512 is a wasteful number, since it uses less digits than its factorization.

21554445512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562 (or 1558 counting only the distinct ones).

The product of its digits is 160000, while the sum is 38.

The spelling of 21554445512 in words is "twenty-one billion, five hundred fifty-four million, four hundred forty-five thousand, five hundred twelve".