221211232117 has 2 divisors, whose sum is σ = 221211232118. Its totient is φ = 221211232116.

The previous prime is 221211232087. The next prime is 221211232129. The reversal of 221211232117 is 711232112122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221157635076 + 53597041 = 470274^2 + 7321^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211232117 - 2²³ = 221202843509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221211232091 and 221211232100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211232217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605616058 + 110605616059.

It is an arithmetic number, because the mean of its divisors is an integer number (110605616059).

Almost surely, 2^221211232117 is an apocalyptic number.

It is an amenable number.

221211232117 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211232117 is an equidigital number, since it uses as much as digits as its factorization.

221211232117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 25.

Adding to 221211232117 its reverse (711232112122), we get a palindrome (932443344239).

The spelling of 221211232117 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred thirty-two thousand, one hundred seventeen".