121156105 has 8 divisors (see below), whose sum is σ = 166156992. Its totient is φ = 83078448.

The previous prime is 121156099. The next prime is 121156109. The reversal of 121156105 is 501651121.

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 121156105 - 2³ = 121156097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121156109) 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, 1730767 + ... + 1730836.

It is an arithmetic number, because the mean of its divisors is an integer number (20769624).

Almost surely, 2^121156105 is an apocalyptic number.

It is an amenable number.

121156105 is a deficient number, since it is larger than the sum of its proper divisors (45000887).

121156105 is an equidigital number, since it uses as much as digits as its factorization.

121156105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3461615.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 121156105 is about 11007.0933947160. The cubic root of 121156105 is about 494.8213551181.

The spelling of 121156105 in words is "one hundred twenty-one million, one hundred fifty-six thousand, one hundred five".