196197906221 has 2 divisors, whose sum is σ = 196197906222. Its totient is φ = 196197906220.

The previous prime is 196197906197. The next prime is 196197906251. The reversal of 196197906221 is 122609791691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195054722500 + 1143183721 = 441650^2 + 33811^2 .

It is an emirp because it is prime and its reverse (122609791691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 196197906221 - 2¹⁴ = 196197889837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196197906251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98098953110 + 98098953111.

It is an arithmetic number, because the mean of its divisors is an integer number (98098953111).

Almost surely, 2^196197906221 is an apocalyptic number.

It is an amenable number.

196197906221 is a deficient number, since it is larger than the sum of its proper divisors (1).

196197906221 is an equidigital number, since it uses as much as digits as its factorization.

196197906221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 53.

The spelling of 196197906221 in words is "one hundred ninety-six billion, one hundred ninety-seven million, nine hundred six thousand, two hundred twenty-one".