121257443 has 4 divisors (see below), whose sum is σ = 121279800. Its totient is φ = 121235088.

The previous prime is 121257431. The next prime is 121257491. The reversal of 121257443 is 344752121.

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 121257443 - 2¹⁶ = 121191907 is a prime.

It is a super-3 number, since 3×121257443³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121253443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2708 + ... + 15806.

It is an arithmetic number, because the mean of its divisors is an integer number (30319950).

Almost surely, 2^121257443 is an apocalyptic number.

121257443 is a deficient number, since it is larger than the sum of its proper divisors (22357).

121257443 is an equidigital number, since it uses as much as digits as its factorization.

121257443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22356.

The product of its digits is 6720, while the sum is 29.

The square root of 121257443 is about 11011.6957368064. The cubic root of 121257443 is about 494.9592769954.

The spelling of 121257443 in words is "one hundred twenty-one million, two hundred fifty-seven thousand, four hundred forty-three".