21764253306 has 8 divisors (see below), whose sum is σ = 43528506624. Its totient is φ = 7254751100.

The previous prime is 21764253289. The next prime is 21764253307. The reversal of 21764253306 is 60335246712.

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

21764253306 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21764253307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1813687770 + ... + 1813687781.

It is an arithmetic number, because the mean of its divisors is an integer number (5441063328).

Almost surely, 2^21764253306 is an apocalyptic number.

21764253306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21764253306 is a wasteful number, since it uses less digits than its factorization.

21764253306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627375556.

The product of its (nonzero) digits is 181440, while the sum is 39.

The spelling of 21764253306 in words is "twenty-one billion, seven hundred sixty-four million, two hundred fifty-three thousand, three hundred six".