20321332123221 has 24 divisors (see below), whose sum is σ = 30898799118720. Its totient is φ = 12834165315456.

The previous prime is 20321332123217. The next prime is 20321332123319. The reversal of 20321332123221 is 12232123312302.

20321332123221 is a `hidden beast` number, since 2 + 0 + 3 + 2 + 1 + 332 + 1 + 2 + 322 + 1 = 666.

It is not a de Polignac number, because 20321332123221 - 2² = 20321332123217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321132123221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4509156 + ... + 7808658.

It is an arithmetic number, because the mean of its divisors is an integer number (1287449963280).

Almost surely, 2^{20321332123221} is an apocalyptic number.

It is an amenable number.

20321332123221 is a deficient number, since it is larger than the sum of its proper divisors (10577466995499).

20321332123221 is a wasteful number, since it uses less digits than its factorization.

20321332123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335545 (or 3335542 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 20321332123221 its reverse (12232123312302), we get a palindrome (32553455435523).

The spelling of 20321332123221 in words is "twenty trillion, three hundred twenty-one billion, three hundred thirty-two million, one hundred twenty-three thousand, two hundred twenty-one".