121218906829 has 2 divisors, whose sum is σ = 121218906830. Its totient is φ = 121218906828.

The previous prime is 121218906791. The next prime is 121218906841. The reversal of 121218906829 is 928609812121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121157597929 + 61308900 = 348077^2 + 7830^2 .

It is a cyclic number.

It is not a de Polignac number, because 121218906829 - 2⁷ = 121218906701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121218906859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60609453414 + 60609453415.

It is an arithmetic number, because the mean of its divisors is an integer number (60609453415).

Almost surely, 2^121218906829 is an apocalyptic number.

It is an amenable number.

121218906829 is a deficient number, since it is larger than the sum of its proper divisors (1).

121218906829 is an equidigital number, since it uses as much as digits as its factorization.

121218906829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 49.

The spelling of 121218906829 in words is "one hundred twenty-one billion, two hundred eighteen million, nine hundred six thousand, eight hundred twenty-nine".