201221001193 has 2 divisors, whose sum is σ = 201221001194. Its totient is φ = 201221001192.

The previous prime is 201221001161. The next prime is 201221001227. The reversal of 201221001193 is 391100122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120344466649 + 80876534544 = 346907^2 + 284388^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221001193 - 2⁵ = 201221001161 is a prime.

It is a super-2 number, since 2×201221001193² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201221001493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610500596 + 100610500597.

It is an arithmetic number, because the mean of its divisors is an integer number (100610500597).

Almost surely, 2^201221001193 is an apocalyptic number.

It is an amenable number.

201221001193 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221001193 is an equidigital number, since it uses as much as digits as its factorization.

201221001193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 201221001193 its reverse (391100122102), we get a palindrome (592321123295).

The spelling of 201221001193 in words is "two hundred one billion, two hundred twenty-one million, one thousand, one hundred ninety-three".