1211001022109 has 2 divisors, whose sum is σ = 1211001022110.
Its totient is φ = 1211001022108.
The previous prime is 1211001022067. The next prime is 1211001022123. The reversal of 1211001022109 is 9012201001121.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1063528125625 + 147472896484 = 1031275^2 + 384022^2
It is an emirp because it is prime and its reverse (9012201001121) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1211001022109 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1211001022159) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605500511054 + 605500511055.
It is an arithmetic number, because the mean of its divisors is an integer number (605500511055).
Almost surely, 21211001022109 is an apocalyptic number.
It is an amenable number.
1211001022109 is a deficient number, since it is larger than the sum of its proper divisors (1).
1211001022109 is an equidigital number, since it uses as much as digits as its factorization.
1211001022109 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 72, while the sum is 20.
The spelling of 1211001022109 in words is "one trillion, two hundred eleven billion, one million, twenty-two thousand, one hundred nine".