21934036518 has 8 divisors (see below), whose sum is σ = 43868073048. Its totient is φ = 7311345504.

The previous prime is 21934036513. The next prime is 21934036547. The reversal of 21934036518 is 81563043912.

21934036518 is nontrivially palindromic in base 9.

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

21934036518 is an admirable number.

It is a super-4 number, since 4×21934036518⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21934036518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21934036513) 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 3 ways as a sum of consecutive naturals, for example, 1827836371 + ... + 1827836382.

It is an arithmetic number, because the mean of its divisors is an integer number (5483509131).

Almost surely, 2^21934036518 is an apocalyptic number.

21934036518 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21934036518 is a wasteful number, since it uses less digits than its factorization.

21934036518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655672758.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 21934036518 in words is "twenty-one billion, nine hundred thirty-four million, thirty-six thousand, five hundred eighteen".