21013012319 has 6 divisors (see below), whose sum is σ = 22753735416. Its totient is φ = 19396626600.

The previous prime is 21013012253. The next prime is 21013012337. The reversal of 21013012319 is 91321031012.

It is not a de Polignac number, because 21013012319 - 2⁸ = 21013012063 is a prime.

It is a super-2 number, since 2×21013012319² (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 = 21013012294 and 21013012303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013012369) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62168507 + ... + 62168844.

It is an arithmetic number, because the mean of its divisors is an integer number (3792289236).

Almost surely, 2^21013012319 is an apocalyptic number.

21013012319 is a deficient number, since it is larger than the sum of its proper divisors (1740723097).

21013012319 is a wasteful number, since it uses less digits than its factorization.

21013012319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124337377 (or 124337364 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 21013012319 in words is "twenty-one billion, thirteen million, twelve thousand, three hundred nineteen".