20331212221393 has 2 divisors, whose sum is σ = 20331212221394. Its totient is φ = 20331212221392.

The previous prime is 20331212221301. The next prime is 20331212221423. The reversal of 20331212221393 is 39312221213302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18934577526544 + 1396634694849 = 4351388^2 + 1181793^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20331212221393 is a prime.

It is not a weakly prime, because it can be changed into another prime (20331212251393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165606110696 + 10165606110697.

It is an arithmetic number, because the mean of its divisors is an integer number (10165606110697).

Almost surely, 2^{20331212221393} is an apocalyptic number.

It is an amenable number.

20331212221393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331212221393 is an equidigital number, since it uses as much as digits as its factorization.

20331212221393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

Adding to 20331212221393 its reverse (39312221213302), we get a palindrome (59643433434695).

The spelling of 20331212221393 in words is "twenty trillion, three hundred thirty-one billion, two hundred twelve million, two hundred twenty-one thousand, three hundred ninety-three".