121400243 has 4 divisors (see below), whose sum is σ = 121424928. Its totient is φ = 121375560.

The previous prime is 121400239. The next prime is 121400261. The reversal of 121400243 is 342004121.

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 121400243 - 2² = 121400239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121460243) 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, 2171 + ... + 15732.

It is an arithmetic number, because the mean of its divisors is an integer number (30356232).

Almost surely, 2^121400243 is an apocalyptic number.

121400243 is a deficient number, since it is larger than the sum of its proper divisors (24685).

121400243 is an equidigital number, since it uses as much as digits as its factorization.

121400243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24684.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 121400243 is about 11018.1778439087. The cubic root of 121400243 is about 495.1534986322.

Adding to 121400243 its reverse (342004121), we get a palindrome (463404364).

The spelling of 121400243 in words is "one hundred twenty-one million, four hundred thousand, two hundred forty-three".