221212124117 has 2 divisors, whose sum is σ = 221212124118. Its totient is φ = 221212124116.

The previous prime is 221212124093. The next prime is 221212124141. The reversal of 221212124117 is 711421212122.

It is a balanced prime because it is at equal distance from previous prime (221212124093) and next prime (221212124141).

It can be written as a sum of positive squares in only one way, i.e., 143772922276 + 77439201841 = 379174^2 + 278279^2 .

It is a cyclic number.

It is not a de Polignac number, because 221212124117 - 2²⁸ = 220943688661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221212124167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606062058 + 110606062059.

It is an arithmetic number, because the mean of its divisors is an integer number (110606062059).

Almost surely, 2^221212124117 is an apocalyptic number.

It is an amenable number.

221212124117 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212124117 is an equidigital number, since it uses as much as digits as its factorization.

221212124117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 26.

Adding to 221212124117 its reverse (711421212122), we get a palindrome (932633336239).

The spelling of 221212124117 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred twenty-four thousand, one hundred seventeen".