121578237843243 has 8 divisors (see below), whose sum is σ = 163192265562000. Its totient is φ = 80508184343328.

The previous prime is 121578237843191. The next prime is 121578237843259. The reversal of 121578237843243 is 342348732875121.

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

It is not a de Polignac number, because 121578237843243 - 2⁸ = 121578237842987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121578237843043) 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, 135993554188 + ... + 135993555081.

It is an arithmetic number, because the mean of its divisors is an integer number (20399033195250).

Almost surely, 2^{121578237843243} is an apocalyptic number.

121578237843243 is a deficient number, since it is larger than the sum of its proper divisors (41614027718757).

121578237843243 is a wasteful number, since it uses less digits than its factorization.

121578237843243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271987109421.

The product of its digits is 54190080, while the sum is 60.

The spelling of 121578237843243 in words is "one hundred twenty-one trillion, five hundred seventy-eight billion, two hundred thirty-seven million, eight hundred forty-three thousand, two hundred forty-three".