221211001222129 has 2 divisors, whose sum is σ = 221211001222130. Its totient is φ = 221211001222128.

The previous prime is 221211001222121. The next prime is 221211001222139. The reversal of 221211001222129 is 921222100112122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196991807532129 + 24219193690000 = 14035377^2 + 4921300^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211001222129 - 2³ = 221211001222121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221211001222097 and 221211001222106.

It is not a weakly prime, because it can be changed into another prime (221211001222121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605500611064 + 110605500611065.

It is an arithmetic number, because the mean of its divisors is an integer number (110605500611065).

Almost surely, 2^{221211001222129} is an apocalyptic number.

It is an amenable number.

221211001222129 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211001222129 is an equidigital number, since it uses as much as digits as its factorization.

221211001222129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 221211001222129 in words is "two hundred twenty-one trillion, two hundred eleven billion, one million, two hundred twenty-two thousand, one hundred twenty-nine".