21608271117 has 12 divisors (see below), whose sum is σ = 31225660284. Its totient is φ = 14399184960.

The previous prime is 21608271067. The next prime is 21608271143. The reversal of 21608271117 is 71117280612.

21608271117 is a `hidden beast` number, since 2 + 1 + 608 + 27 + 11 + 17 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15123834441 + 6484436676 = 122979^2 + 80526^2 .

It is not a de Polignac number, because 21608271117 - 2¹¹ = 21608269069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21608271187) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 505758 + ... + 546815.

It is an arithmetic number, because the mean of its divisors is an integer number (2602138357).

Almost surely, 2^21608271117 is an apocalyptic number.

It is an amenable number.

21608271117 is a deficient number, since it is larger than the sum of its proper divisors (9617389167).

21608271117 is a wasteful number, since it uses less digits than its factorization.

21608271117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054860 (or 1054857 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 36.

The spelling of 21608271117 in words is "twenty-one billion, six hundred eight million, two hundred seventy-one thousand, one hundred seventeen".