21011224305 has 16 divisors (see below), whose sum is σ = 33689957184. Its totient is φ = 11181986880.

The previous prime is 21011224279. The next prime is 21011224313. The reversal of 21011224305 is 50342211012.

It is not a de Polignac number, because 21011224305 - 2⁸ = 21011224049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1492726 + ... + 1506735.

It is an arithmetic number, because the mean of its divisors is an integer number (2105622324).

Almost surely, 2^21011224305 is an apocalyptic number.

It is an amenable number.

21011224305 is a deficient number, since it is larger than the sum of its proper divisors (12678732879).

21011224305 is a wasteful number, since it uses less digits than its factorization.

21011224305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2999936.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21011224305 its reverse (50342211012), we get a palindrome (71353435317).

The spelling of 21011224305 in words is "twenty-one billion, eleven million, two hundred twenty-four thousand, three hundred five".