21115503245366 has 8 divisors (see below), whose sum is σ = 33536387507400. Its totient is φ = 9936707409568.

The previous prime is 21115503245323. The next prime is 21115503245377. The reversal of 21115503245366 is 66354230551112.

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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310522106516 + ... + 310522106583.

It is an arithmetic number, because the mean of its divisors is an integer number (4192048438425).

Almost surely, 2^{21115503245366} is an apocalyptic number.

21115503245366 is a deficient number, since it is larger than the sum of its proper divisors (12420884262034).

21115503245366 is a wasteful number, since it uses less digits than its factorization.

21115503245366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621044213118.

The product of its (nonzero) digits is 648000, while the sum is 44.

Adding to 21115503245366 its reverse (66354230551112), we get a palindrome (87469733796478).

The spelling of 21115503245366 in words is "twenty-one trillion, one hundred fifteen billion, five hundred three million, two hundred forty-five thousand, three hundred sixty-six".