21040032319 has 4 divisors (see below), whose sum is σ = 21064699096. Its totient is φ = 21015365544.

The previous prime is 21040032313. The next prime is 21040032331. The reversal of 21040032319 is 91323004012.

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

It is a cyclic number.

It is not a de Polignac number, because 21040032319 - 2⁵ = 21040032287 is a prime.

It is a super-2 number, since 2×21040032319² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21040032293 and 21040032302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040032313) 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, 12332109 + ... + 12333814.

It is an arithmetic number, because the mean of its divisors is an integer number (5266174774).

Almost surely, 2^21040032319 is an apocalyptic number.

21040032319 is a deficient number, since it is larger than the sum of its proper divisors (24666777).

21040032319 is an equidigital number, since it uses as much as digits as its factorization.

21040032319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24666776.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 21040032319 in words is "twenty-one billion, forty million, thirty-two thousand, three hundred nineteen".