21456865412 has 48 divisors (see below), whose sum is σ = 39088998144. Its totient is φ = 10300080000.

The previous prime is 21456865379. The next prime is 21456865427.

21456865412 is nontrivially palindromic in base 10.

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 15 ways as a sum of consecutive naturals, for example, 1743593 + ... + 1755855.

It is an arithmetic number, because the mean of its divisors is an integer number (814354128).

Almost surely, 2^21456865412 is an apocalyptic number.

It is an amenable number.

21456865412 is a deficient number, since it is larger than the sum of its proper divisors (17632132732).

21456865412 is a wasteful number, since it uses less digits than its factorization.

21456865412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12500 (or 12498 counting only the distinct ones).

The product of its digits is 460800, while the sum is 44.

The spelling of 21456865412 in words is "twenty-one billion, four hundred fifty-six million, eight hundred sixty-five thousand, four hundred twelve".