20331321000197 has 2 divisors, whose sum is σ = 20331321000198. Its totient is φ = 20331321000196.

The previous prime is 20331321000149. The next prime is 20331321000217. The reversal of 20331321000197 is 79100012313302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19956867570721 + 374453429476 = 4467311^2 + 611926^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331321000197 - 2¹⁰ = 20331320999173 is a prime.

It is a super-2 number, since 2×20331321000197² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331321050197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165660500098 + 10165660500099.

It is an arithmetic number, because the mean of its divisors is an integer number (10165660500099).

Almost surely, 2^{20331321000197} is an apocalyptic number.

It is an amenable number.

20331321000197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331321000197 is an equidigital number, since it uses as much as digits as its factorization.

20331321000197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

Adding to 20331321000197 its reverse (79100012313302), we get a palindrome (99431333313499).

The spelling of 20331321000197 in words is "twenty trillion, three hundred thirty-one billion, three hundred twenty-one million, one hundred ninety-seven", and thus it is an aban number.