21214240518 has 8 divisors (see below), whose sum is σ = 42428481048. Its totient is φ = 7071413504.

The previous prime is 21214240511. The next prime is 21214240529. The reversal of 21214240518 is 81504241212.

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

21214240518 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214240511) 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, 1767853371 + ... + 1767853382.

It is an arithmetic number, because the mean of its divisors is an integer number (5303560131).

Almost surely, 2^21214240518 is an apocalyptic number.

21214240518 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.

21214240518 is a wasteful number, since it uses less digits than its factorization.

21214240518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535706758.

The product of its (nonzero) digits is 5120, while the sum is 30.

The spelling of 21214240518 in words is "twenty-one billion, two hundred fourteen million, two hundred forty thousand, five hundred eighteen".