121440401243 has 8 divisors (see below), whose sum is σ = 138819218688. Its totient is φ = 104069130984.

The previous prime is 121440401231. The next prime is 121440401263. The reversal of 121440401243 is 342104044121.

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

It is not a de Polignac number, because 121440401243 - 2¹⁰ = 121440400219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121440401263) 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, 1852271 + ... + 1916712.

It is an arithmetic number, because the mean of its divisors is an integer number (17352402336).

Almost surely, 2^121440401243 is an apocalyptic number.

121440401243 is a deficient number, since it is larger than the sum of its proper divisors (17378817445).

121440401243 is an equidigital number, since it uses as much as digits as its factorization.

121440401243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3773593.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 121440401243 its reverse (342104044121), we get a palindrome (463544445364).

The spelling of 121440401243 in words is "one hundred twenty-one billion, four hundred forty million, four hundred one thousand, two hundred forty-three".