21864080519 has 4 divisors (see below), whose sum is σ = 22618014360. Its totient is φ = 21110146680.

The previous prime is 21864080503. The next prime is 21864080521. The reversal of 21864080519 is 91508046812.

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 21864080519 - 2⁴ = 21864080503 is a prime.

It is a super-2 number, since 2×21864080519² (a number of 21 digits) contains 22 as substring.

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 21864080519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21864080599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376966877 + ... + 376966934.

It is an arithmetic number, because the mean of its divisors is an integer number (5654503590).

Almost surely, 2^21864080519 is an apocalyptic number.

21864080519 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21864080519 is a deficient number, since it is larger than the sum of its proper divisors (753933841).

21864080519 is an equidigital number, since it uses as much as digits as its factorization.

21864080519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753933840.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 21864080519 in words is "twenty-one billion, eight hundred sixty-four million, eighty thousand, five hundred nineteen".