221173126201 has 2 divisors, whose sum is σ = 221173126202. Its totient is φ = 221173126200.

The previous prime is 221173126193. The next prime is 221173126247. The reversal of 221173126201 is 102621371122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145561325625 + 75611800576 = 381525^2 + 274976^2 .

It is a cyclic number.

It is not a de Polignac number, because 221173126201 - 2³ = 221173126193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221173126201.

It is not a weakly prime, because it can be changed into another prime (221173126271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110586563100 + 110586563101.

It is an arithmetic number, because the mean of its divisors is an integer number (110586563101).

Almost surely, 2^221173126201 is an apocalyptic number.

It is an amenable number.

221173126201 is a deficient number, since it is larger than the sum of its proper divisors (1).

221173126201 is an equidigital number, since it uses as much as digits as its factorization.

221173126201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 221173126201 its reverse (102621371122), we get a palindrome (323794497323).

The spelling of 221173126201 in words is "two hundred twenty-one billion, one hundred seventy-three million, one hundred twenty-six thousand, two hundred one".