21317742919 has 8 divisors (see below), whose sum is σ = 23256901008. Its totient is φ = 19378781760.

The previous prime is 21317742917. The next prime is 21317742959. The reversal of 21317742919 is 91924771312.

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 21317742919 - 2¹ = 21317742917 is a prime.

It is a super-2 number, since 2×21317742919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21317742917) 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, 263539 + ... + 334795.

It is an arithmetic number, because the mean of its divisors is an integer number (2907112626).

Almost surely, 2^21317742919 is an apocalyptic number.

21317742919 is a deficient number, since it is larger than the sum of its proper divisors (1939158089).

21317742919 is a wasteful number, since it uses less digits than its factorization.

21317742919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98465.

The product of its digits is 190512, while the sum is 46.

The spelling of 21317742919 in words is "twenty-one billion, three hundred seventeen million, seven hundred forty-two thousand, nine hundred nineteen".