212431233340421 has 2 divisors, whose sum is σ = 212431233340422. Its totient is φ = 212431233340420.

The previous prime is 212431233340387. The next prime is 212431233340451. The reversal of 212431233340421 is 124043332134212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210001079719396 + 2430153621025 = 14491414^2 + 1558895^2 .

It is a cyclic number.

It is not a de Polignac number, because 212431233340421 - 2¹⁸ = 212431233078277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212431233340451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106215616670210 + 106215616670211.

It is an arithmetic number, because the mean of its divisors is an integer number (106215616670211).

Almost surely, 2^{212431233340421} is an apocalyptic number.

It is an amenable number.

212431233340421 is a deficient number, since it is larger than the sum of its proper divisors (1).

212431233340421 is an equidigital number, since it uses as much as digits as its factorization.

212431233340421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 212431233340421 its reverse (124043332134212), we get a palindrome (336474565474633).

The spelling of 212431233340421 in words is "two hundred twelve trillion, four hundred thirty-one billion, two hundred thirty-three million, three hundred forty thousand, four hundred twenty-one".