21905334005 has 16 divisors (see below), whose sum is σ = 27197873280. Its totient is φ = 16916843328.

The previous prime is 21905333977. The next prime is 21905334007. The reversal of 21905334005 is 50043350912.

It is a cyclic number.

It is not a de Polignac number, because 21905334005 - 2⁶ = 21905333941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21905334007) 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, 1045664 + ... + 1066406.

It is an arithmetic number, because the mean of its divisors is an integer number (1699867080).

Almost surely, 2^21905334005 is an apocalyptic number.

It is an amenable number.

21905334005 is a deficient number, since it is larger than the sum of its proper divisors (5292539275).

21905334005 is a wasteful number, since it uses less digits than its factorization.

21905334005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28060.

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 21905334005 its reverse (50043350912), we get a palindrome (71948684917).

The spelling of 21905334005 in words is "twenty-one billion, nine hundred five million, three hundred thirty-four thousand, five".