221315068181 has 2 divisors, whose sum is σ = 221315068182. Its totient is φ = 221315068180.

The previous prime is 221315068129. The next prime is 221315068189. The reversal of 221315068181 is 181860513122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198907972081 + 22407096100 = 445991^2 + 149690^2 .

It is a cyclic number.

It is not a de Polignac number, because 221315068181 - 2²² = 221310873877 is a prime.

It is a super-2 number, since 2×221315068181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221315068189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110657534090 + 110657534091.

It is an arithmetic number, because the mean of its divisors is an integer number (110657534091).

Almost surely, 2^221315068181 is an apocalyptic number.

It is an amenable number.

221315068181 is a deficient number, since it is larger than the sum of its proper divisors (1).

221315068181 is an equidigital number, since it uses as much as digits as its factorization.

221315068181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 221315068181 in words is "two hundred twenty-one billion, three hundred fifteen million, sixty-eight thousand, one hundred eighty-one".