212403304124021 has 2 divisors, whose sum is σ = 212403304124022. Its totient is φ = 212403304124020.

The previous prime is 212403304124009. The next prime is 212403304124041. The reversal of 212403304124021 is 120421403304212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130782667800625 + 81620636323396 = 11436025^2 + 9034414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212403304124021 is a prime.

It is a super-2 number, since 2×212403304124021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212403304124041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106201652062010 + 106201652062011.

It is an arithmetic number, because the mean of its divisors is an integer number (106201652062011).

Almost surely, 2^{212403304124021} is an apocalyptic number.

It is an amenable number.

212403304124021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212403304124021 is an equidigital number, since it uses as much as digits as its factorization.

212403304124021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 212403304124021 its reverse (120421403304212), we get a palindrome (332824707428233).

The spelling of 212403304124021 in words is "two hundred twelve trillion, four hundred three billion, three hundred four million, one hundred twenty-four thousand, twenty-one".