213201020331961 has 2 divisors, whose sum is σ = 213201020331962. Its totient is φ = 213201020331960.

The previous prime is 213201020331947. The next prime is 213201020332039. The reversal of 213201020331961 is 169133020102312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132157004353936 + 81044015978025 = 11495956^2 + 9002445^2 .

It is a cyclic number.

It is not a de Polignac number, because 213201020331961 - 2⁹ = 213201020331449 is a prime.

It is not a weakly prime, because it can be changed into another prime (213201020361961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106600510165980 + 106600510165981.

It is an arithmetic number, because the mean of its divisors is an integer number (106600510165981).

Almost surely, 2^{213201020331961} is an apocalyptic number.

It is an amenable number.

213201020331961 is a deficient number, since it is larger than the sum of its proper divisors (1).

213201020331961 is an equidigital number, since it uses as much as digits as its factorization.

213201020331961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 213201020331961 in words is "two hundred thirteen trillion, two hundred one billion, twenty million, three hundred thirty-one thousand, nine hundred sixty-one".