121021010189 has 2 divisors, whose sum is σ = 121021010190. Its totient is φ = 121021010188.

The previous prime is 121021010179. The next prime is 121021010203. The reversal of 121021010189 is 981010120121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118635469225 + 2385540964 = 344435^2 + 48842^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021010189 - 2⁸ = 121021009933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121021010179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510505094 + 60510505095.

It is an arithmetic number, because the mean of its divisors is an integer number (60510505095).

Almost surely, 2^121021010189 is an apocalyptic number.

It is an amenable number.

121021010189 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021010189 is an equidigital number, since it uses as much as digits as its factorization.

121021010189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 121021010189 in words is "one hundred twenty-one billion, twenty-one million, ten thousand, one hundred eighty-nine".