21223550456 has 16 divisors (see below), whose sum is σ = 39972609600. Its totient is φ = 10564187904.

The previous prime is 21223550317. The next prime is 21223550461. The reversal of 21223550456 is 65405532212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5946521 + ... + 5950088.

It is an arithmetic number, because the mean of its divisors is an integer number (2498288100).

Almost surely, 2^21223550456 is an apocalyptic number.

It is an amenable number.

21223550456 is a deficient number, since it is larger than the sum of its proper divisors (18749059144).

21223550456 is a wasteful number, since it uses less digits than its factorization.

21223550456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11896838 (or 11896834 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 21223550456 in words is "twenty-one billion, two hundred twenty-three million, five hundred fifty thousand, four hundred fifty-six".