21115321422424 has 16 divisors (see below), whose sum is σ = 40511953892520. Its totient is φ = 10312133717760.

The previous prime is 21115321422407. The next prime is 21115321422439. The reversal of 21115321422424 is 42422412351112.

It is a self number, because there is not a number n which added to its sum of digits gives 21115321422424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30690873817 + ... + 30690874504.

Almost surely, 2^{21115321422424} is an apocalyptic number.

It is an amenable number.

21115321422424 is a deficient number, since it is larger than the sum of its proper divisors (19396632470096).

21115321422424 is a wasteful number, since it uses less digits than its factorization.

21115321422424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61381748370 (or 61381748366 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

Adding to 21115321422424 its reverse (42422412351112), we get a palindrome (63537733773536).

The spelling of 21115321422424 in words is "twenty-one trillion, one hundred fifteen billion, three hundred twenty-one million, four hundred twenty-two thousand, four hundred twenty-four".