21165334126 has 32 divisors (see below), whose sum is σ = 34159633920. Its totient is φ = 9803851200.

The previous prime is 21165334123. The next prime is 21165334187. The reversal of 21165334126 is 62143356112.

It is a junction number, because it is equal to n+sod(n) for n = 21165334091 and 21165334100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21165334121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2354821 + ... + 2363791.

It is an arithmetic number, because the mean of its divisors is an integer number (1067488560).

Almost surely, 2^21165334126 is an apocalyptic number.

21165334126 is a deficient number, since it is larger than the sum of its proper divisors (12994299794).

21165334126 is a wasteful number, since it uses less digits than its factorization.

21165334126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10360.

The product of its digits is 25920, while the sum is 34.

The spelling of 21165334126 in words is "twenty-one billion, one hundred sixty-five million, three hundred thirty-four thousand, one hundred twenty-six".