21616803457206 has 16 divisors (see below), whose sum is σ = 43351409662464. Its totient is φ = 7185967361064.

The previous prime is 21616803457181. The next prime is 21616803457229. The reversal of 21616803457206 is 60275430861612.

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, 4908445450 + ... + 4908449853.

It is an arithmetic number, because the mean of its divisors is an integer number (2709463103904).

Almost surely, 2^{21616803457206} is an apocalyptic number.

21616803457206 is an abundant number, since it is smaller than the sum of its proper divisors (21734606205258).

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

21616803457206 is a wasteful number, since it uses less digits than its factorization.

21616803457206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9816895675.

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 21616803457206 in words is "twenty-one trillion, six hundred sixteen billion, eight hundred three million, four hundred fifty-seven thousand, two hundred six".