121712143 has 4 divisors (see below), whose sum is σ = 139099600. Its totient is φ = 104324688.

The previous prime is 121712137. The next prime is 121712167. The reversal of 121712143 is 341217121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121712143 - 2¹⁷ = 121581071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121712743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8693718 + ... + 8693731.

It is an arithmetic number, because the mean of its divisors is an integer number (34774900).

Almost surely, 2^121712143 is an apocalyptic number.

121712143 is a deficient number, since it is larger than the sum of its proper divisors (17387457).

121712143 is an equidigital number, since it uses as much as digits as its factorization.

121712143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17387456.

The product of its digits is 336, while the sum is 22.

The square root of 121712143 is about 11032.3226475661. The cubic root of 121712143 is about 495.5771834082.

Adding to 121712143 its reverse (341217121), we get a palindrome (462929264).

The spelling of 121712143 in words is "one hundred twenty-one million, seven hundred twelve thousand, one hundred forty-three".