21302109764 has 12 divisors (see below), whose sum is σ = 40146283884. Its totient is φ = 9831742944.

The previous prime is 21302109707. The next prime is 21302109767. The reversal of 21302109764 is 46790120312.

It can be written as a sum of positive squares in 2 ways, for example, as 7894322500 + 13407787264 = 88850^2 + 115792^2 .

It is not an unprimeable number, because it can be changed into a prime (21302109767) by changing a digit.

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, 204827927 + ... + 204828030.

It is an arithmetic number, because the mean of its divisors is an integer number (3345523657).

Almost surely, 2^21302109764 is an apocalyptic number.

It is an amenable number.

21302109764 is a deficient number, since it is larger than the sum of its proper divisors (18844174120).

21302109764 is a wasteful number, since it uses less digits than its factorization.

21302109764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409655974 (or 409655972 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 21302109764 in words is "twenty-one billion, three hundred two million, one hundred nine thousand, seven hundred sixty-four".