121989393143 has 4 divisors (see below), whose sum is σ = 121999353168. Its totient is φ = 121979433120.

The previous prime is 121989393037. The next prime is 121989393161. The reversal of 121989393143 is 341393989121.

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 121989393143 - 2⁸ = 121989392887 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 (121989398143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4961618 + ... + 4986143.

It is an arithmetic number, because the mean of its divisors is an integer number (30499838292).

Almost surely, 2^121989393143 is an apocalyptic number.

121989393143 is a deficient number, since it is larger than the sum of its proper divisors (9960025).

121989393143 is an equidigital number, since it uses as much as digits as its factorization.

121989393143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9960024.

The product of its digits is 1259712, while the sum is 53.

The spelling of 121989393143 in words is "one hundred twenty-one billion, nine hundred eighty-nine million, three hundred ninety-three thousand, one hundred forty-three".