121542143 has 8 divisors (see below), whose sum is σ = 126941568. Its totient is φ = 116152344.

The previous prime is 121542139. The next prime is 121542149. The reversal of 121542143 is 341245121.

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 121542143 - 2² = 121542139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121542149) 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, 38096 + ... + 41162.

It is an arithmetic number, because the mean of its divisors is an integer number (15867696).

Almost surely, 2^121542143 is an apocalyptic number.

121542143 is a deficient number, since it is larger than the sum of its proper divisors (5399425).

121542143 is a wasteful number, since it uses less digits than its factorization.

121542143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813.

The product of its digits is 960, while the sum is 23.

The square root of 121542143 is about 11024.6153220872. The cubic root of 121542143 is about 495.3463453731.

Adding to 121542143 its reverse (341245121), we get a palindrome (462787264).

The spelling of 121542143 in words is "one hundred twenty-one million, five hundred forty-two thousand, one hundred forty-three".