21240315230 has 8 divisors (see below), whose sum is σ = 38232567432. Its totient is φ = 8496126088.

The previous prime is 21240315221. The next prime is 21240315263. The reversal of 21240315230 is 3251304212.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21240315196 and 21240315205.

It is a congruent number.

It is an unprimeable number.

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, 1062015752 + ... + 1062015771.

It is an arithmetic number, because the mean of its divisors is an integer number (4779070929).

Almost surely, 2^21240315230 is an apocalyptic number.

21240315230 is a deficient number, since it is larger than the sum of its proper divisors (16992252202).

21240315230 is a wasteful number, since it uses less digits than its factorization.

21240315230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124031530.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21240315230 its reverse (3251304212), we get a palindrome (24491619442).

The spelling of 21240315230 in words is "twenty-one billion, two hundred forty million, three hundred fifteen thousand, two hundred thirty".