21234201205 has 48 divisors (see below), whose sum is σ = 30541639680. Its totient is φ = 14123816448.

The previous prime is 21234201193. The next prime is 21234201221. The reversal of 21234201205 is 50210243212.

It is a happy number.

It is not a de Polignac number, because 21234201205 - 2³¹ = 19086717557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1293036 + ... + 1309354.

It is an arithmetic number, because the mean of its divisors is an integer number (636284160).

Almost surely, 2^21234201205 is an apocalyptic number.

It is an amenable number.

21234201205 is a deficient number, since it is larger than the sum of its proper divisors (9307438475).

21234201205 is a wasteful number, since it uses less digits than its factorization.

21234201205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16498 (or 16491 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21234201205 its reverse (50210243212), we get a palindrome (71444444417).

The spelling of 21234201205 in words is "twenty-one billion, two hundred thirty-four million, two hundred one thousand, two hundred five".