21319387513 has 8 divisors (see below), whose sum is σ = 22514565920. Its totient is φ = 20131519680.

The previous prime is 21319387469. The next prime is 21319387519. The reversal of 21319387513 is 31578391312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21319387513 - 2²¹ = 21317290361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21319387513.

It is not an unprimeable number, because it can be changed into a prime (21319387519) 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 7 ways as a sum of consecutive naturals, for example, 1821648 + ... + 1833313.

It is an arithmetic number, because the mean of its divisors is an integer number (2814320740).

Almost surely, 2^21319387513 is an apocalyptic number.

It is an amenable number.

21319387513 is a deficient number, since it is larger than the sum of its proper divisors (1195178407).

21319387513 is a wasteful number, since it uses less digits than its factorization.

21319387513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655287.

The product of its digits is 136080, while the sum is 43.

The spelling of 21319387513 in words is "twenty-one billion, three hundred nineteen million, three hundred eighty-seven thousand, five hundred thirteen".