196115043231721 has 2 divisors, whose sum is σ = 196115043231722. Its totient is φ = 196115043231720.

The previous prime is 196115043231707. The next prime is 196115043231769. The reversal of 196115043231721 is 127132340511691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124162236981721 + 71952806250000 = 11142811^2 + 8482500^2 .

It is an emirp because it is prime and its reverse (127132340511691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 196115043231721 - 2¹³ = 196115043223529 is a prime.

It is a super-2 number, since 2×196115043231721² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (196115043231781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98057521615860 + 98057521615861.

It is an arithmetic number, because the mean of its divisors is an integer number (98057521615861).

Almost surely, 2^{196115043231721} is an apocalyptic number.

It is an amenable number.

196115043231721 is a deficient number, since it is larger than the sum of its proper divisors (1).

196115043231721 is an equidigital number, since it uses as much as digits as its factorization.

196115043231721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 196115043231721 in words is "one hundred ninety-six trillion, one hundred fifteen billion, forty-three million, two hundred thirty-one thousand, seven hundred twenty-one".