21450316256 has 48 divisors (see below), whose sum is σ = 42607627776. Its totient is φ = 10629513216.

The previous prime is 21450316243. The next prime is 21450316309. The reversal of 21450316256 is 65261305412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4943720 + ... + 4948056.

It is an arithmetic number, because the mean of its divisors is an integer number (887658912).

Almost surely, 2^21450316256 is an apocalyptic number.

It is an amenable number.

21450316256 is a deficient number, since it is larger than the sum of its proper divisors (21157311520).

21450316256 is a wasteful number, since it uses less digits than its factorization.

21450316256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691 (or 5683 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21450316256 in words is "twenty-one billion, four hundred fifty million, three hundred sixteen thousand, two hundred fifty-six".