21010446416 has 20 divisors (see below), whose sum is σ = 42020893824. Its totient is φ = 10166344800.

The previous prime is 21010446409. The next prime is 21010446469. The reversal of 21010446416 is 61464401012.

21010446416 is an admirable number.

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, 21179390 + ... + 21180381.

Almost surely, 2^21010446416 is an apocalyptic number.

It is an amenable number.

21010446416 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21010446416 is a wasteful number, since it uses less digits than its factorization.

21010446416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42359810 (or 42359804 counting only the distinct ones).

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

Adding to 21010446416 its reverse (61464401012), we get a palindrome (82474847428).

The spelling of 21010446416 in words is "twenty-one billion, ten million, four hundred forty-six thousand, four hundred sixteen".