20331212012281 has 2 divisors, whose sum is σ = 20331212012282. Its totient is φ = 20331212012280.

The previous prime is 20331212012269. The next prime is 20331212012339. The reversal of 20331212012281 is 18221021213302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18039897075600 + 2291314936681 = 4247340^2 + 1513709^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331212012281 - 2⁹ = 20331212011769 is a prime.

It is a super-2 number, since 2×20331212012281² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20331212012981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165606006140 + 10165606006141.

It is an arithmetic number, because the mean of its divisors is an integer number (10165606006141).

Almost surely, 2^{20331212012281} is an apocalyptic number.

It is an amenable number.

20331212012281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331212012281 is an equidigital number, since it uses as much as digits as its factorization.

20331212012281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 20331212012281 its reverse (18221021213302), we get a palindrome (38552233225583).

The spelling of 20331212012281 in words is "twenty trillion, three hundred thirty-one billion, two hundred twelve million, twelve thousand, two hundred eighty-one".