21113203365365 has 32 divisors (see below), whose sum is σ = 25532124134400. Its totient is φ = 16760247275520.

The previous prime is 21113203365337. The next prime is 21113203365391. The reversal of 21113203365365 is 56356330231112.

It is a de Polignac number, because none of the positive numbers 2^k-21113203365365 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1400722469 + ... + 1400737541.

It is an arithmetic number, because the mean of its divisors is an integer number (797878879200).

Almost surely, 2^{21113203365365} is an apocalyptic number.

It is an amenable number.

21113203365365 is a deficient number, since it is larger than the sum of its proper divisors (4418920769035).

21113203365365 is a wasteful number, since it uses less digits than its factorization.

21113203365365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19397.

The product of its (nonzero) digits is 291600, while the sum is 41.

Adding to 21113203365365 its reverse (56356330231112), we get a palindrome (77469533596477).

The spelling of 21113203365365 in words is "twenty-one trillion, one hundred thirteen billion, two hundred three million, three hundred sixty-five thousand, three hundred sixty-five".