121209181 has 8 divisors (see below), whose sum is σ = 122961920. Its totient is φ = 119469168.

The previous prime is 121209169. The next prime is 121209203. The reversal of 121209181 is 181902121.

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 121209181 - 2¹¹ = 121207133 is a prime.

It is a super-2 number, since 2×121209181² = 29383331117381522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121209281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16900 + ... + 22978.

It is an arithmetic number, because the mean of its divisors is an integer number (15370240).

Almost surely, 2^121209181 is an apocalyptic number.

It is an amenable number.

121209181 is a deficient number, since it is larger than the sum of its proper divisors (1752739).

121209181 is a wasteful number, since it uses less digits than its factorization.

121209181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6363.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 121209181 is about 11009.5041214398. The cubic root of 121209181 is about 494.8936015918.

The spelling of 121209181 in words is "one hundred twenty-one million, two hundred nine thousand, one hundred eighty-one".