121042145 has 16 divisors (see below), whose sum is σ = 167557248. Its totient is φ = 82222080.

The previous prime is 121042139. The next prime is 121042147. The reversal of 121042145 is 541240121.

It is a happy number.

It is not a de Polignac number, because 121042145 - 2⁶ = 121042081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121042147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12416 + ... + 19905.

It is an arithmetic number, because the mean of its divisors is an integer number (10472328).

Almost surely, 2^121042145 is an apocalyptic number.

It is an amenable number.

121042145 is a deficient number, since it is larger than the sum of its proper divisors (46515103).

121042145 is a wasteful number, since it uses less digits than its factorization.

121042145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32440.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 121042145 is about 11001.9155150365. The cubic root of 121042145 is about 494.6661626880. Note that the first 3 decimals are identical.

Adding to 121042145 its reverse (541240121), we get a palindrome (662282266).

The spelling of 121042145 in words is "one hundred twenty-one million, forty-two thousand, one hundred forty-five".