211221130323197 has 2 divisors, whose sum is σ = 211221130323198. Its totient is φ = 211221130323196.

The previous prime is 211221130323173. The next prime is 211221130323271. The reversal of 211221130323197 is 791323031122112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210995553770596 + 225576552601 = 14525686^2 + 474949^2 .

It is a cyclic number.

It is not a de Polignac number, because 211221130323197 - 2³² = 211216835355901 is a prime.

It is a super-2 number, since 2×211221130323197² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221130323197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221130326197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610565161598 + 105610565161599.

It is an arithmetic number, because the mean of its divisors is an integer number (105610565161599).

Almost surely, 2^{211221130323197} is an apocalyptic number.

It is an amenable number.

211221130323197 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221130323197 is an equidigital number, since it uses as much as digits as its factorization.

211221130323197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The spelling of 211221130323197 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred thirty million, three hundred twenty-three thousand, one hundred ninety-seven".