221211020111117 has 2 divisors, whose sum is σ = 221211020111118. Its totient is φ = 221211020111116.

The previous prime is 221211020111069. The next prime is 221211020111149. The reversal of 221211020111117 is 711111020112122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212484585076201 + 8726435034916 = 14576851^2 + 2954054^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211020111117 - 2⁴⁴ = 203618834066701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221211020111092 and 221211020111101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221201020111117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605510055558 + 110605510055559.

It is an arithmetic number, because the mean of its divisors is an integer number (110605510055559).

Almost surely, 2^{221211020111117} is an apocalyptic number.

It is an amenable number.

221211020111117 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211020111117 is an equidigital number, since it uses as much as digits as its factorization.

221211020111117 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 23.

Adding to 221211020111117 its reverse (711111020112122), we get a palindrome (932322040223239).

The spelling of 221211020111117 in words is "two hundred twenty-one trillion, two hundred eleven billion, twenty million, one hundred eleven thousand, one hundred seventeen".