21231220223321 has 8 divisors (see below), whose sum is σ = 21743422308288. Its totient is φ = 20724939550000.

The previous prime is 21231220223309. The next prime is 21231220223329. The reversal of 21231220223321 is 12332202213212.

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 21231220223321 - 2²² = 21231216029017 is a prime.

It is a super-2 number, since 2×21231220223321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231220223329) 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, 1480345655 + ... + 1480359996.

It is an arithmetic number, because the mean of its divisors is an integer number (2717927788536).

Almost surely, 2^{21231220223321} is an apocalyptic number.

It is an amenable number.

21231220223321 is a deficient number, since it is larger than the sum of its proper divisors (512202084967).

21231220223321 is a wasteful number, since it uses less digits than its factorization.

21231220223321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960705823.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21231220223321 its reverse (12332202213212), we get a palindrome (33563422436533).

The spelling of 21231220223321 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred twenty million, two hundred twenty-three thousand, three hundred twenty-one".