121278143 has 8 divisors (see below), whose sum is σ = 138721440. Its totient is φ = 103864320.

The previous prime is 121278139. The next prime is 121278167. The reversal of 121278143 is 341872121.

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

It is not a de Polignac number, because 121278143 - 2² = 121278139 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121278133) 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, 2303 + ... + 15743.

It is an arithmetic number, because the mean of its divisors is an integer number (17340180).

Almost surely, 2^121278143 is an apocalyptic number.

121278143 is a deficient number, since it is larger than the sum of its proper divisors (17443297).

121278143 is a wasteful number, since it uses less digits than its factorization.

121278143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14737.

The product of its digits is 2688, while the sum is 29.

The square root of 121278143 is about 11012.6356064296. The cubic root of 121278143 is about 494.9874404187.

The spelling of 121278143 in words is "one hundred twenty-one million, two hundred seventy-eight thousand, one hundred forty-three".