1221110122109 has 2 divisors, whose sum is σ = 1221110122110. Its totient is φ = 1221110122108.

The previous prime is 1221110122093. The next prime is 1221110122159. The reversal of 1221110122109 is 9012210111221.

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., 1165151854084 + 55958268025 = 1079422^2 + 236555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221110122109 - 2⁴ = 1221110122093 is a prime.

It is a super-2 number, since 2×1221110122109² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221110122159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610555061054 + 610555061055.

It is an arithmetic number, because the mean of its divisors is an integer number (610555061055).

Almost surely, 2^{1221110122109} is an apocalyptic number.

It is an amenable number.

1221110122109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221110122109 is an equidigital number, since it uses as much as digits as its factorization.

1221110122109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 1221110122109 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, one hundred twenty-two thousand, one hundred nine".