221212121212073 has 2 divisors, whose sum is σ = 221212121212074. Its totient is φ = 221212121212072.

The previous prime is 221212121212057. The next prime is 221212121212123. The reversal of 221212121212073 is 370212121212122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213142129974544 + 8069991237529 = 14599388^2 + 2840773^2 .

It is a cyclic number.

It is not a de Polignac number, because 221212121212073 - 2⁴ = 221212121212057 is a prime.

It is a super-2 number, since 2×221212121212073² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221212121212013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606060606036 + 110606060606037.

It is an arithmetic number, because the mean of its divisors is an integer number (110606060606037).

Almost surely, 2^{221212121212073} is an apocalyptic number.

It is an amenable number.

221212121212073 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212121212073 is an equidigital number, since it uses as much as digits as its factorization.

221212121212073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

Adding to 221212121212073 its reverse (370212121212122), we get a palindrome (591424242424195).

The spelling of 221212121212073 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, seventy-three".