21334204221 has 8 divisors (see below), whose sum is σ = 31031569824. Its totient is φ = 12929820720.

The previous prime is 21334204217. The next prime is 21334204259. The reversal of 21334204221 is 12240243312.

It is a happy number.

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

It is not a de Polignac number, because 21334204221 - 2² = 21334204217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21334204191 and 21334204200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334204201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323245486 + ... + 323245551.

It is an arithmetic number, because the mean of its divisors is an integer number (3878946228).

Almost surely, 2^21334204221 is an apocalyptic number.

It is an amenable number.

21334204221 is a deficient number, since it is larger than the sum of its proper divisors (9697365603).

21334204221 is a wasteful number, since it uses less digits than its factorization.

21334204221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646491051.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21334204221 its reverse (12240243312), we get a palindrome (33574447533).

The spelling of 21334204221 in words is "twenty-one billion, three hundred thirty-four million, two hundred four thousand, two hundred twenty-one".