21927145916809 has 64 divisors (see below), whose sum is σ = 27487210291200. Its totient is φ = 17068103827200.

The previous prime is 21927145916783. The next prime is 21927145916881. The reversal of 21927145916809 is 90861954172912.

It is a cyclic number.

It is not a de Polignac number, because 21927145916809 - 2¹⁵ = 21927145884041 is a prime.

It is a super-2 number, since 2×21927145916809² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21927145116809) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2701381419 + ... + 2701389535.

It is an arithmetic number, because the mean of its divisors is an integer number (429487660800).

Almost surely, 2^{21927145916809} is an apocalyptic number.

It is an amenable number.

21927145916809 is a deficient number, since it is larger than the sum of its proper divisors (5560064374391).

21927145916809 is a wasteful number, since it uses less digits than its factorization.

21927145916809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14294.

The product of its (nonzero) digits is 19595520, while the sum is 64.

The spelling of 21927145916809 in words is "twenty-one trillion, nine hundred twenty-seven billion, one hundred forty-five million, nine hundred sixteen thousand, eight hundred nine".