121012001989 has 2 divisors, whose sum is σ = 121012001990. Its totient is φ = 121012001988.

The previous prime is 121012001983. The next prime is 121012002029. The reversal of 121012001989 is 989100210121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72762365025 + 48249636964 = 269745^2 + 219658^2 .

It is a cyclic number.

It is not a de Polignac number, because 121012001989 - 2¹⁹ = 121011477701 is a prime.

It is a super-2 number, since 2×121012001989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121012001983) 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, 60506000994 + 60506000995.

It is an arithmetic number, because the mean of its divisors is an integer number (60506000995).

Almost surely, 2^121012001989 is an apocalyptic number.

It is an amenable number.

121012001989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121012001989 is an equidigital number, since it uses as much as digits as its factorization.

121012001989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 121012001989 in words is "one hundred twenty-one billion, twelve million, one thousand, nine hundred eighty-nine".