21221133230221 has 8 divisors (see below), whose sum is σ = 22498740269600. Its totient is φ = 19959596719920.

The previous prime is 21221133230081. The next prime is 21221133230267. The reversal of 21221133230221 is 12203233112212.

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-21221133230221 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 (21221133234221) 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, 4017629550 + ... + 4017634831.

It is an arithmetic number, because the mean of its divisors is an integer number (2812342533700).

Almost surely, 2^{21221133230221} is an apocalyptic number.

It is an amenable number.

21221133230221 is a deficient number, since it is larger than the sum of its proper divisors (1277607039379).

21221133230221 is a wasteful number, since it uses less digits than its factorization.

21221133230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8035264539.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21221133230221 its reverse (12203233112212), we get a palindrome (33424366342433).

The spelling of 21221133230221 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirty-three million, two hundred thirty thousand, two hundred twenty-one".