21115326206 has 8 divisors (see below), whose sum is σ = 34109373144. Its totient is φ = 9745535160.

The previous prime is 21115326163. The next prime is 21115326247. The reversal of 21115326206 is 60262351112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21115326206³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

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, 406063940 + ... + 406063991.

It is an arithmetic number, because the mean of its divisors is an integer number (4263671643).

Almost surely, 2^21115326206 is an apocalyptic number.

21115326206 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21115326206 is a deficient number, since it is larger than the sum of its proper divisors (12994046938).

21115326206 is a wasteful number, since it uses less digits than its factorization.

21115326206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812127946.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 21115326206 its reverse (60262351112), we get a palindrome (81377677318).

The spelling of 21115326206 in words is "twenty-one billion, one hundred fifteen million, three hundred twenty-six thousand, two hundred six".