21191939326 has 12 divisors (see below), whose sum is σ = 32846406336. Its totient is φ = 10254163260.

The previous prime is 21191939323. The next prime is 21191939333. The reversal of 21191939326 is 62393919112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21191939323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5511070 + ... + 5514913.

It is an arithmetic number, because the mean of its divisors is an integer number (2737200528).

Almost surely, 2^21191939326 is an apocalyptic number.

21191939326 is a deficient number, since it is larger than the sum of its proper divisors (11654467010).

21191939326 is a wasteful number, since it uses less digits than its factorization.

21191939326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11026047 (or 11026016 counting only the distinct ones).

The product of its digits is 157464, while the sum is 46.

The spelling of 21191939326 in words is "twenty-one billion, one hundred ninety-one million, nine hundred thirty-nine thousand, three hundred twenty-six".