21513021319 has 4 divisors (see below), whose sum is σ = 22448370096. Its totient is φ = 20577672544.

The previous prime is 21513021307. The next prime is 21513021323. The reversal of 21513021319 is 91312031512.

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 21513021319 - 2¹¹ = 21513019271 is a prime.

It is a super-2 number, since 2×21513021319² (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 (21513021359) 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, 467674354 + ... + 467674399.

It is an arithmetic number, because the mean of its divisors is an integer number (5612092524).

Almost surely, 2^21513021319 is an apocalyptic number.

21513021319 is a deficient number, since it is larger than the sum of its proper divisors (935348777).

21513021319 is an equidigital number, since it uses as much as digits as its factorization.

21513021319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935348776.

The product of its (nonzero) digits is 1620, while the sum is 28.

The spelling of 21513021319 in words is "twenty-one billion, five hundred thirteen million, twenty-one thousand, three hundred nineteen".