121143643 has 16 divisors (see below), whose sum is σ = 129477600. Its totient is φ = 113137920.

The previous prime is 121143641. The next prime is 121143647. The reversal of 121143643 is 346341121.

It is a cyclic number.

It is not a de Polignac number, because 121143643 - 2¹ = 121143641 is a prime.

It is a super-3 number, since 3×121143643³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121143641) 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 15 ways as a sum of consecutive naturals, for example, 164905 + ... + 165637.

It is an arithmetic number, because the mean of its divisors is an integer number (8092350).

Almost surely, 2^121143643 is an apocalyptic number.

121143643 is a deficient number, since it is larger than the sum of its proper divisors (8333957).

121143643 is a wasteful number, since it uses less digits than its factorization.

121143643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942.

The product of its digits is 1728, while the sum is 25.

The square root of 121143643 is about 11006.5272906580. The cubic root of 121143643 is about 494.8043889207.

Adding to 121143643 its reverse (346341121), we get a palindrome (467484764).

The spelling of 121143643 in words is "one hundred twenty-one million, one hundred forty-three thousand, six hundred forty-three".