21519450608 has 40 divisors (see below), whose sum is σ = 42089770368. Its totient is φ = 10657697792.

The previous prime is 21519450599. The next prime is 21519450649. The reversal of 21519450608 is 80605491512.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 3987560 + ... + 3992952.

Almost surely, 2^21519450608 is an apocalyptic number.

It is an amenable number.

21519450608 is a deficient number, since it is larger than the sum of its proper divisors (20570319760).

21519450608 is a wasteful number, since it uses less digits than its factorization.

21519450608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7721 (or 7715 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 21519450608 in words is "twenty-one billion, five hundred nineteen million, four hundred fifty thousand, six hundred eight".