121356143989 has 2 divisors, whose sum is σ = 121356143990. Its totient is φ = 121356143988.

The previous prime is 121356143983. The next prime is 121356144017. The reversal of 121356143989 is 989341653121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72223875025 + 49132268964 = 268745^2 + 221658^2 .

It is a cyclic number.

It is not a de Polignac number, because 121356143989 - 2⁵ = 121356143957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121356143983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60678071994 + 60678071995.

It is an arithmetic number, because the mean of its divisors is an integer number (60678071995).

Almost surely, 2^121356143989 is an apocalyptic number.

It is an amenable number.

121356143989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121356143989 is an equidigital number, since it uses as much as digits as its factorization.

121356143989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The spelling of 121356143989 in words is "one hundred twenty-one billion, three hundred fifty-six million, one hundred forty-three thousand, nine hundred eighty-nine".