21318017235 has 8 divisors (see below), whose sum is σ = 34108827600. Its totient is φ = 11369609184.

The previous prime is 21318017219. The next prime is 21318017243. The reversal of 21318017235 is 53271081312.

It is a happy number.

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

It is not a de Polignac number, because 21318017235 - 2⁴ = 21318017219 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21318017196 and 21318017205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710600560 + ... + 710600589.

It is an arithmetic number, because the mean of its divisors is an integer number (4263603450).

Almost surely, 2^21318017235 is an apocalyptic number.

21318017235 is a deficient number, since it is larger than the sum of its proper divisors (12790810365).

21318017235 is a wasteful number, since it uses less digits than its factorization.

21318017235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421201157.

The product of its (nonzero) digits is 10080, while the sum is 33.

Adding to 21318017235 its reverse (53271081312), we get a palindrome (74589098547).

The spelling of 21318017235 in words is "twenty-one billion, three hundred eighteen million, seventeen thousand, two hundred thirty-five".