121209121 has 8 divisors (see below), whose sum is σ = 132368544. Its totient is φ = 110073120.

The previous prime is 121209107. The next prime is 121209139. The reversal of 121209121 is 121902121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121209121 - 2⁹ = 121208609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121204121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6030 + ... + 16696.

It is an arithmetic number, because the mean of its divisors is an integer number (16546068).

Almost surely, 2^121209121 is an apocalyptic number.

121209121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121209121 is a deficient number, since it is larger than the sum of its proper divisors (11159423).

121209121 is a wasteful number, since it uses less digits than its factorization.

121209121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11711.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 121209121 is about 11009.5013965211. The cubic root of 121209121 is about 494.8935199323.

The spelling of 121209121 in words is "one hundred twenty-one million, two hundred nine thousand, one hundred twenty-one".