21343324221 has 12 divisors (see below), whose sum is σ = 31334644380. Its totient is φ = 13995622080.

The previous prime is 21343324201. The next prime is 21343324231. The reversal of 21343324221 is 12242334312.

21343324221 is a `hidden beast` number, since 2 + 1 + 3 + 433 + 2 + 4 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1746404100 + 19596920121 = 41790^2 + 139989^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21343324221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343324201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19437816 + ... + 19438913.

It is an arithmetic number, because the mean of its divisors is an integer number (2611220365).

Almost surely, 2^21343324221 is an apocalyptic number.

It is an amenable number.

21343324221 is a deficient number, since it is larger than the sum of its proper divisors (9991320159).

21343324221 is a wasteful number, since it uses less digits than its factorization.

21343324221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38876796 (or 38876793 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21343324221 its reverse (12242334312), we get a palindrome (33585658533).

The spelling of 21343324221 in words is "twenty-one billion, three hundred forty-three million, three hundred twenty-four thousand, two hundred twenty-one".