16731461221 has 2 divisors, whose sum is σ = 16731461222. Its totient is φ = 16731461220.

The previous prime is 16731461177. The next prime is 16731461233. The reversal of 16731461221 is 12216413761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16515077121 + 216384100 = 128511^2 + 14710^2 .

It is an emirp because it is prime and its reverse (12216413761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16731461221 - 2⁷ = 16731461093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16731461281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8365730610 + 8365730611.

It is an arithmetic number, because the mean of its divisors is an integer number (8365730611).

Almost surely, 2^16731461221 is an apocalyptic number.

It is an amenable number.

16731461221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16731461221 is an equidigital number, since it uses as much as digits as its factorization.

16731461221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

Adding to 16731461221 its reverse (12216413761), we get a palindrome (28947874982).

The spelling of 16731461221 in words is "sixteen billion, seven hundred thirty-one million, four hundred sixty-one thousand, two hundred twenty-one".