12210121081 has 2 divisors, whose sum is σ = 12210121082. Its totient is φ = 12210121080.

The previous prime is 12210121073. The next prime is 12210121139. The reversal of 12210121081 is 18012101221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8620194025 + 3589927056 = 92845^2 + 59916^2 .

It is a cyclic number.

It is not a de Polignac number, because 12210121081 - 2³ = 12210121073 is a prime.

It is a super-2 number, since 2×12210121081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12210121051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105060540 + 6105060541.

It is an arithmetic number, because the mean of its divisors is an integer number (6105060541).

Almost surely, 2^12210121081 is an apocalyptic number.

It is an amenable number.

12210121081 is a deficient number, since it is larger than the sum of its proper divisors (1).

12210121081 is an equidigital number, since it uses as much as digits as its factorization.

12210121081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

The spelling of 12210121081 in words is "twelve billion, two hundred ten million, one hundred twenty-one thousand, eighty-one".