21308132726 has 8 divisors (see below), whose sum is σ = 31991606400. Its totient is φ = 10644263928.

The previous prime is 21308132683. The next prime is 21308132731. The reversal of 21308132726 is 62723180312.

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

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, 4898501 + ... + 4902848.

It is an arithmetic number, because the mean of its divisors is an integer number (3998950800).

Almost surely, 2^21308132726 is an apocalyptic number.

21308132726 is a deficient number, since it is larger than the sum of its proper divisors (10683473674).

21308132726 is a wasteful number, since it uses less digits than its factorization.

21308132726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9802438.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 21308132726 in words is "twenty-one billion, three hundred eight million, one hundred thirty-two thousand, seven hundred twenty-six".