121002121001989 has 2 divisors, whose sum is σ = 121002121001990. Its totient is φ = 121002121001988.

The previous prime is 121002121001959. The next prime is 121002121002029. The reversal of 121002121001989 is 989100121200121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76185228412225 + 44816892589764 = 8728415^2 + 6694542^2 .

It is a cyclic number.

It is not a de Polignac number, because 121002121001989 - 2⁹ = 121002121001477 is a prime.

It is a super-2 number, since 2×121002121001989² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121002121001959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60501060500994 + 60501060500995.

It is an arithmetic number, because the mean of its divisors is an integer number (60501060500995).

Almost surely, 2^{121002121001989} is an apocalyptic number.

It is an amenable number.

121002121001989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121002121001989 is an equidigital number, since it uses as much as digits as its factorization.

121002121001989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 37.

The spelling of 121002121001989 in words is "one hundred twenty-one trillion, two billion, one hundred twenty-one million, one thousand, nine hundred eighty-nine".