20331312011221 has 8 divisors (see below), whose sum is σ = 20334370361760. Its totient is φ = 20328253915728.

The previous prime is 20331312011149. The next prime is 20331312011233. The reversal of 20331312011221 is 12211021313302.

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 20331312011221 - 2²³ = 20331303622613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20331312011192 and 20331312011201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331312015221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206156895 + ... + 206255491.

It is an arithmetic number, because the mean of its divisors is an integer number (2541796295220).

Almost surely, 2^{20331312011221} is an apocalyptic number.

It is an amenable number.

20331312011221 is a deficient number, since it is larger than the sum of its proper divisors (3058350539).

20331312011221 is a wasteful number, since it uses less digits than its factorization.

20331312011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127523.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 20331312011221 its reverse (12211021313302), we get a palindrome (32542333324523).

The spelling of 20331312011221 in words is "twenty trillion, three hundred thirty-one billion, three hundred twelve million, eleven thousand, two hundred twenty-one".