21112665430305 has 16 divisors (see below), whose sum is σ = 33834837021120. Its totient is φ = 11241897451968.

The previous prime is 21112665430303. The next prime is 21112665430319. The reversal of 21112665430305 is 50303456621112.

It is a happy number.

It is not a de Polignac number, because 21112665430305 - 2¹ = 21112665430303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112665430303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1136914002 + ... + 1136932571.

It is an arithmetic number, because the mean of its divisors is an integer number (2114677313820).

Almost surely, 2^{21112665430305} is an apocalyptic number.

It is an amenable number.

21112665430305 is a deficient number, since it is larger than the sum of its proper divisors (12722171590815).

21112665430305 is a wasteful number, since it uses less digits than its factorization.

21112665430305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273847200.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 21112665430305 in words is "twenty-one trillion, one hundred twelve billion, six hundred sixty-five million, four hundred thirty thousand, three hundred five".