21202030305 has 24 divisors (see below), whose sum is σ = 36880067328. Its totient is φ = 11267786016.

The previous prime is 21202030277. The next prime is 21202030321. The reversal of 21202030305 is 50303020212.

It is not a de Polignac number, because 21202030305 - 2¹⁹ = 21201506017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 819697 + ... + 845166.

It is an arithmetic number, because the mean of its divisors is an integer number (1536669472).

Almost surely, 2^21202030305 is an apocalyptic number.

It is an amenable number.

21202030305 is a deficient number, since it is larger than the sum of its proper divisors (15678037023).

21202030305 is a wasteful number, since it uses less digits than its factorization.

21202030305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665157 (or 1665154 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

Adding to 21202030305 its reverse (50303020212), we get a palindrome (71505050517).

The spelling of 21202030305 in words is "twenty-one billion, two hundred two million, thirty thousand, three hundred five".