21320309762 has 4 divisors (see below), whose sum is σ = 31980464646. Its totient is φ = 10660154880.

The previous prime is 21320309761. The next prime is 21320309779. The reversal of 21320309762 is 26790302312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18319351801 + 3000957961 = 135349^2 + 54781^2 .

It is not an unprimeable number, because it can be changed into a prime (21320309761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330077439 + ... + 5330077442.

Almost surely, 2^21320309762 is an apocalyptic number.

21320309762 is a deficient number, since it is larger than the sum of its proper divisors (10660154884).

21320309762 is a wasteful number, since it uses less digits than its factorization.

21320309762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10660154883.

The product of its (nonzero) digits is 27216, while the sum is 35.

The spelling of 21320309762 in words is "twenty-one billion, three hundred twenty million, three hundred nine thousand, seven hundred sixty-two".