21650563416 has 32 divisors (see below), whose sum is σ = 54168672960. Its totient is φ = 7211219232.

The previous prime is 21650563397. The next prime is 21650563421. The reversal of 21650563416 is 61436505612.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320770 + ... + 382353.

It is an arithmetic number, because the mean of its divisors is an integer number (1692771030).

Almost surely, 2^21650563416 is an apocalyptic number.

It is an amenable number.

21650563416 is an abundant number, since it is smaller than the sum of its proper divisors (32518109544).

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

21650563416 is a wasteful number, since it uses less digits than its factorization.

21650563416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704415 (or 704411 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 21650563416 in words is "twenty-one billion, six hundred fifty million, five hundred sixty-three thousand, four hundred sixteen".