221011202117 has 2 divisors, whose sum is σ = 221011202118. Its totient is φ = 221011202116.

The previous prime is 221011202081. The next prime is 221011202131. The reversal of 221011202117 is 711202110122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139581443236 + 81429758881 = 373606^2 + 285359^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011202117 - 2¹⁰ = 221011201093 is a prime.

It is a super-2 number, since 2×221011202117² (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 (221011202017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505601058 + 110505601059.

It is an arithmetic number, because the mean of its divisors is an integer number (110505601059).

Almost surely, 2^221011202117 is an apocalyptic number.

It is an amenable number.

221011202117 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011202117 is an equidigital number, since it uses as much as digits as its factorization.

221011202117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 221011202117 its reverse (711202110122), we get a palindrome (932213312239).

The spelling of 221011202117 in words is "two hundred twenty-one billion, eleven million, two hundred two thousand, one hundred seventeen".