431111041212221 has 2 divisors, whose sum is σ = 431111041212222. Its totient is φ = 431111041212220.

The previous prime is 431111041212199. The next prime is 431111041212277. The reversal of 431111041212221 is 122212140111134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260960148456121 + 170150892756100 = 16154261^2 + 13044190^2 .

It is a cyclic number.

It is not a de Polignac number, because 431111041212221 - 2¹⁴ = 431111041195837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431111041212281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215555520606110 + 215555520606111.

It is an arithmetic number, because the mean of its divisors is an integer number (215555520606111).

Almost surely, 2^{431111041212221} is an apocalyptic number.

It is an amenable number.

431111041212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

431111041212221 is an equidigital number, since it uses as much as digits as its factorization.

431111041212221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 26.

Adding to 431111041212221 its reverse (122212140111134), we get a palindrome (553323181323355).

The spelling of 431111041212221 in words is "four hundred thirty-one trillion, one hundred eleven billion, forty-one million, two hundred twelve thousand, two hundred twenty-one".