21115606612 has 12 divisors (see below), whose sum is σ = 37318176756. Its totient is φ = 10453270400.

The previous prime is 21115606609. The next prime is 21115606639. The reversal of 21115606612 is 21660651112.

It can be written as a sum of positive squares in 2 ways, for example, as 18361876036 + 2753730576 = 135506^2 + 52476^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26132773 + ... + 26133580.

It is an arithmetic number, because the mean of its divisors is an integer number (3109848063).

Almost surely, 2^21115606612 is an apocalyptic number.

It is an amenable number.

21115606612 is a deficient number, since it is larger than the sum of its proper divisors (16202570144).

21115606612 is a wasteful number, since it uses less digits than its factorization.

21115606612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52266458 (or 52266456 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 21115606612 in words is "twenty-one billion, one hundred fifteen million, six hundred six thousand, six hundred twelve".