211222100126221 has 2 divisors, whose sum is σ = 211222100126222. Its totient is φ = 211222100126220.

The previous prime is 211222100126201. The next prime is 211222100126231. The reversal of 211222100126221 is 122621001222112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176565495962025 + 34656604164196 = 13287795^2 + 5886986^2 .

It is a cyclic number.

It is not a de Polignac number, because 211222100126221 - 2⁵ = 211222100126189 is a prime.

It is a super-2 number, since 2×211222100126221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211222100126201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105611050063110 + 105611050063111.

It is an arithmetic number, because the mean of its divisors is an integer number (105611050063111).

Almost surely, 2^{211222100126221} is an apocalyptic number.

It is an amenable number.

211222100126221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222100126221 is an equidigital number, since it uses as much as digits as its factorization.

211222100126221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 211222100126221 its reverse (122621001222112), we get a palindrome (333843101348333).

The spelling of 211222100126221 in words is "two hundred eleven trillion, two hundred twenty-two billion, one hundred million, one hundred twenty-six thousand, two hundred twenty-one".