21283889506 has 8 divisors (see below), whose sum is σ = 34828182864. Its totient is φ = 9674495220.

The previous prime is 21283889503. The next prime is 21283889519. The reversal of 21283889506 is 60598838212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21283889503) 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 3 ways as a sum of consecutive naturals, for example, 483724740 + ... + 483724783.

It is an arithmetic number, because the mean of its divisors is an integer number (4353522858).

Almost surely, 2^21283889506 is an apocalyptic number.

21283889506 is a deficient number, since it is larger than the sum of its proper divisors (13544293358).

21283889506 is a wasteful number, since it uses less digits than its factorization.

21283889506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967449536.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 21283889506 in words is "twenty-one billion, two hundred eighty-three million, eight hundred eighty-nine thousand, five hundred six".