121221029 has 2 divisors, whose sum is σ = 121221030. Its totient is φ = 121221028.

The previous prime is 121221019. The next prime is 121221031. The reversal of 121221029 is 920122121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87928129 + 33292900 = 9377^2 + 5770^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221029 - 2⁴ = 121221013 is a prime.

Together with 121221031, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121221029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610514 + 60610515.

It is an arithmetic number, because the mean of its divisors is an integer number (60610515).

Almost surely, 2^121221029 is an apocalyptic number.

It is an amenable number.

121221029 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221029 is an equidigital number, since it uses as much as digits as its factorization.

121221029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 121221029 is about 11010.0421888383. The cubic root of 121221029 is about 494.9097260809.

The spelling of 121221029 in words is "one hundred twenty-one million, two hundred twenty-one thousand, twenty-nine".