21849552518 has 8 divisors (see below), whose sum is σ = 32777977800. Its totient is φ = 10923559920.

The previous prime is 21849552511. The next prime is 21849552589. The reversal of 21849552518 is 81525594812.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849552511) 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, 585548 + ... + 621743.

It is an arithmetic number, because the mean of its divisors is an integer number (4097247225).

Almost surely, 2^21849552518 is an apocalyptic number.

21849552518 is a deficient number, since it is larger than the sum of its proper divisors (10928425282).

21849552518 is a wasteful number, since it uses less digits than its factorization.

21849552518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216342.

The product of its digits is 1152000, while the sum is 50.

The spelling of 21849552518 in words is "twenty-one billion, eight hundred forty-nine million, five hundred fifty-two thousand, five hundred eighteen".