21628021416 has 32 divisors (see below), whose sum is σ = 54285487200. Its totient is φ = 7180616000.

The previous prime is 21628021399. The next prime is 21628021427. The reversal of 21628021416 is 61412082612.

It is a happy 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, 1789131 + ... + 1801178.

It is an arithmetic number, because the mean of its divisors is an integer number (1696421475).

Almost surely, 2^21628021416 is an apocalyptic number.

It is an amenable number.

21628021416 is an abundant number, since it is smaller than the sum of its proper divisors (32657465784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21628021416 is a wasteful number, since it uses less digits than its factorization.

21628021416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590569 (or 3590565 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 21628021416 in words is "twenty-one billion, six hundred twenty-eight million, twenty-one thousand, four hundred sixteen".