21413324221 has 8 divisors (see below), whose sum is σ = 21879446400. Its totient is φ = 20947640448.

The previous prime is 21413324213. The next prime is 21413324351. The reversal of 21413324221 is 12242331412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21413324221 - 2³ = 21413324213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413324021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9876 + ... + 207181.

It is an arithmetic number, because the mean of its divisors is an integer number (2734930800).

Almost surely, 2^21413324221 is an apocalyptic number.

It is an amenable number.

21413324221 is a deficient number, since it is larger than the sum of its proper divisors (466122179).

21413324221 is a wasteful number, since it uses less digits than its factorization.

21413324221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219203.

The product of its digits is 2304, while the sum is 25.

Adding to 21413324221 its reverse (12242331412), we get a palindrome (33655655633).

The spelling of 21413324221 in words is "twenty-one billion, four hundred thirteen million, three hundred twenty-four thousand, two hundred twenty-one".