21004305319 has 4 divisors (see below), whose sum is σ = 21212268840. Its totient is φ = 20796341800.

The previous prime is 21004305293. The next prime is 21004305323. The reversal of 21004305319 is 91350340012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004305319 is a prime.

It is a super-2 number, since 2×21004305319² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004305389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103981609 + ... + 103981810.

It is an arithmetic number, because the mean of its divisors is an integer number (5303067210).

Almost surely, 2^21004305319 is an apocalyptic number.

21004305319 is a deficient number, since it is larger than the sum of its proper divisors (207963521).

21004305319 is a wasteful number, since it uses less digits than its factorization.

21004305319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207963520.

The product of its (nonzero) digits is 3240, while the sum is 28.

The spelling of 21004305319 in words is "twenty-one billion, four million, three hundred five thousand, three hundred nineteen".