21223230221 has 8 divisors (see below), whose sum is σ = 21388618944. Its totient is φ = 21057892960.

The previous prime is 21223230211. The next prime is 21223230239. The reversal of 21223230221 is 12203232212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223230221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21223230193 and 21223230202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223230211) 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, 1492481 + ... + 1506633.

It is an arithmetic number, because the mean of its divisors is an integer number (2673577368).

Almost surely, 2^21223230221 is an apocalyptic number.

It is an amenable number.

21223230221 is a deficient number, since it is larger than the sum of its proper divisors (165388723).

21223230221 is a wasteful number, since it uses less digits than its factorization.

21223230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25731.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21223230221 its reverse (12203232212), we get a palindrome (33426462433).

The spelling of 21223230221 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirty thousand, two hundred twenty-one".