121221929 has 2 divisors, whose sum is σ = 121221930. Its totient is φ = 121221928.

The previous prime is 121221911. The next prime is 121221941. The reversal of 121221929 is 929122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82446400 + 38775529 = 9080^2 + 6227^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221929 - 2¹⁶ = 121156393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121221979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610964 + 60610965.

It is an arithmetic number, because the mean of its divisors is an integer number (60610965).

Almost surely, 2^121221929 is an apocalyptic number.

It is an amenable number.

121221929 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221929 is an equidigital number, since it uses as much as digits as its factorization.

121221929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 29.

The square root of 121221929 is about 11010.0830605405. The cubic root of 121221929 is about 494.9109508894.

The spelling of 121221929 in words is "one hundred twenty-one million, two hundred twenty-one thousand, nine hundred twenty-nine".