21050216594 has 16 divisors (see below), whose sum is σ = 35095731840. Its totient is φ = 9387746160.

The previous prime is 21050216591. The next prime is 21050216609. The reversal of 21050216594 is 49561205012.

It is a happy number.

It is a super-2 number, since 2×21050216594² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21050216591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9025514 + ... + 9027845.

It is an arithmetic number, because the mean of its divisors is an integer number (2193483240).

Almost surely, 2^21050216594 is an apocalyptic number.

21050216594 is a deficient number, since it is larger than the sum of its proper divisors (14045515246).

21050216594 is a wasteful number, since it uses less digits than its factorization.

21050216594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18053425.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 21050216594 in words is "twenty-one billion, fifty million, two hundred sixteen thousand, five hundred ninety-four".