21221132313221 has 8 divisors (see below), whose sum is σ = 21256494030144. Its totient is φ = 21185773729120.

The previous prime is 21221132313211. The next prime is 21221132313259. The reversal of 21221132313221 is 12231323112212.

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-21221132313221 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 (21221132313211) 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, 12976856 + ... + 14520366.

It is an arithmetic number, because the mean of its divisors is an integer number (2657061753768).

Almost surely, 2^{21221132313221} is an apocalyptic number.

It is an amenable number.

21221132313221 is a deficient number, since it is larger than the sum of its proper divisors (35361716923).

21221132313221 is a wasteful number, since it uses less digits than its factorization.

21221132313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566411.

The product of its digits is 1728, while the sum is 26.

Adding to 21221132313221 its reverse (12231323112212), we get a palindrome (33452455425433).

The spelling of 21221132313221 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirty-two million, three hundred thirteen thousand, two hundred twenty-one".