21224612216 has 16 divisors (see below), whose sum is σ = 40871720040. Its totient is φ = 10325486880.

The previous prime is 21224612209. The next prime is 21224612263. The reversal of 21224612216 is 61221642212.

It is a congruent number.

It is an unprimeable number.

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, 35852090 + ... + 35852681.

Almost surely, 2^21224612216 is an apocalyptic number.

It is an amenable number.

21224612216 is a deficient number, since it is larger than the sum of its proper divisors (19647107824).

21224612216 is a wasteful number, since it uses less digits than its factorization.

21224612216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71704814 (or 71704810 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The spelling of 21224612216 in words is "twenty-one billion, two hundred twenty-four million, six hundred twelve thousand, two hundred sixteen".