21002341305 has 16 divisors (see below), whose sum is σ = 36658632384. Its totient is φ = 10182953280.

The previous prime is 21002341291. The next prime is 21002341309. The reversal of 21002341305 is 50314320012.

It is not a de Polignac number, because 21002341305 - 2²³ = 20993952697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002341309) 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, 63643294 + ... + 63643623.

It is an arithmetic number, because the mean of its divisors is an integer number (2291164524).

Almost surely, 2^21002341305 is an apocalyptic number.

It is an amenable number.

21002341305 is a deficient number, since it is larger than the sum of its proper divisors (15656291079).

21002341305 is a wasteful number, since it uses less digits than its factorization.

21002341305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127286936.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21002341305 its reverse (50314320012), we get a palindrome (71316661317).

The spelling of 21002341305 in words is "twenty-one billion, two million, three hundred forty-one thousand, three hundred five".