21106560308 has 12 divisors (see below), whose sum is σ = 37206090852. Its totient is φ = 10476248640.

The previous prime is 21106560289. The next prime is 21106560313. The reversal of 21106560308 is 80306560112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15418685584 + 5687874724 = 124172^2 + 75418^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19257263 + ... + 19258358.

It is an arithmetic number, because the mean of its divisors is an integer number (3100507571).

Almost surely, 2^21106560308 is an apocalyptic number.

It is an amenable number.

21106560308 is a deficient number, since it is larger than the sum of its proper divisors (16099530544).

21106560308 is a wasteful number, since it uses less digits than its factorization.

21106560308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38515762 (or 38515760 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 21106560308 in words is "twenty-one billion, one hundred six million, five hundred sixty thousand, three hundred eight".