121029989 has 4 divisors (see below), whose sum is σ = 121199040. Its totient is φ = 120860940.

The previous prime is 121029977. The next prime is 121030001. The reversal of 121029989 is 989920121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (121029977) and next prime (121030001).

It is a cyclic number.

It is not a de Polignac number, because 121029989 - 2¹⁶ = 120964453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83447 + ... + 84884.

It is an arithmetic number, because the mean of its divisors is an integer number (30299760).

Almost surely, 2^121029989 is an apocalyptic number.

It is an amenable number.

121029989 is a deficient number, since it is larger than the sum of its proper divisors (169051).

121029989 is an equidigital number, since it uses as much as digits as its factorization.

121029989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169050.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 121029989 is about 11001.3630519132. The cubic root of 121029989 is about 494.6496027172.

The spelling of 121029989 in words is "one hundred twenty-one million, twenty-nine thousand, nine hundred eighty-nine".