121989011 has 4 divisors (see below), whose sum is σ = 122203224. Its totient is φ = 121774800.

The previous prime is 121988989. The next prime is 121989031. The reversal of 121989011 is 110989121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121989011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121989031) 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, 106250 + ... + 107391.

It is an arithmetic number, because the mean of its divisors is an integer number (30550806).

Almost surely, 2^121989011 is an apocalyptic number.

121989011 is a deficient number, since it is larger than the sum of its proper divisors (214213).

121989011 is an equidigital number, since it uses as much as digits as its factorization.

121989011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214212.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 121989011 is about 11044.8635573284. The cubic root of 121989011 is about 495.9526747142.

It can be divided in two parts, 1219890 and 11, that multiplied together give a triangular number (13418790 = T₅₁₈₀).

The spelling of 121989011 in words is "one hundred twenty-one million, nine hundred eighty-nine thousand, eleven".