121210122181 has 2 divisors, whose sum is σ = 121210122182. Its totient is φ = 121210122180.

The previous prime is 121210122169. The next prime is 121210122263. The reversal of 121210122181 is 181221012121.

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., 61021350625 + 60188771556 = 247025^2 + 245334^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210122181 - 2¹⁹ = 121209597893 is a prime.

It is a super-3 number, since 3×121210122181³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210122101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605061090 + 60605061091.

It is an arithmetic number, because the mean of its divisors is an integer number (60605061091).

Almost surely, 2^121210122181 is an apocalyptic number.

It is an amenable number.

121210122181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210122181 is an equidigital number, since it uses as much as digits as its factorization.

121210122181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

The spelling of 121210122181 in words is "one hundred twenty-one billion, two hundred ten million, one hundred twenty-two thousand, one hundred eighty-one".