21304103773 has 4 divisors (see below), whose sum is σ = 21306191868. Its totient is φ = 21302015680.

The previous prime is 21304103747. The next prime is 21304103803. The reversal of 21304103773 is 37730140312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4362998809 + 16941104964 = 66053^2 + 130158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21304103773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304103273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1028668 + ... + 1049173.

It is an arithmetic number, because the mean of its divisors is an integer number (5326547967).

Almost surely, 2^21304103773 is an apocalyptic number.

It is an amenable number.

21304103773 is a deficient number, since it is larger than the sum of its proper divisors (2088095).

21304103773 is a wasteful number, since it uses less digits than its factorization.

21304103773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088094.

The product of its (nonzero) digits is 10584, while the sum is 31.

The spelling of 21304103773 in words is "twenty-one billion, three hundred four million, one hundred three thousand, seven hundred seventy-three".