20331212221321 has 8 divisors (see below), whose sum is σ = 20542010558720. Its totient is φ = 20120438337408.

The previous prime is 20331212221301. The next prime is 20331212221393. The reversal of 20331212221321 is 12312221213302.

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 20331212221321 - 2³⁵ = 20296852482953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20331212221301) 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, 4439541 + ... + 7769938.

It is an arithmetic number, because the mean of its divisors is an integer number (2567751319840).

Almost surely, 2^{20331212221321} is an apocalyptic number.

It is an amenable number.

20331212221321 is a deficient number, since it is larger than the sum of its proper divisors (210798337399).

20331212221321 is a wasteful number, since it uses less digits than its factorization.

20331212221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12226743.

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

Adding to 20331212221321 its reverse (12312221213302), we get a palindrome (32643433434623).

The spelling of 20331212221321 in words is "twenty trillion, three hundred thirty-one billion, two hundred twelve million, two hundred twenty-one thousand, three hundred twenty-one".