21117703860365 has 32 divisors (see below), whose sum is σ = 28980675962880. Its totient is φ = 14471087400000.

The previous prime is 21117703860349. The next prime is 21117703860373. The reversal of 21117703860365 is 56306830771112.

It is not a de Polignac number, because 21117703860365 - 2⁴ = 21117703860349 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, 390037466 + ... + 390091604.

It is an arithmetic number, because the mean of its divisors is an integer number (905646123840).

Almost surely, 2^{21117703860365} is an apocalyptic number.

It is an amenable number.

21117703860365 is a deficient number, since it is larger than the sum of its proper divisors (7862972102515).

21117703860365 is a wasteful number, since it uses less digits than its factorization.

21117703860365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61353.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 21117703860365 in words is "twenty-one trillion, one hundred seventeen billion, seven hundred three million, eight hundred sixty thousand, three hundred sixty-five".