121660243 has 4 divisors (see below), whose sum is σ = 124627608. Its totient is φ = 118692880.

The previous prime is 121660223. The next prime is 121660349. The reversal of 121660243 is 342066121.

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 121660243 - 2⁹ = 121659731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121660223) 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, 1483621 + ... + 1483702.

It is an arithmetic number, because the mean of its divisors is an integer number (31156902).

Almost surely, 2^121660243 is an apocalyptic number.

121660243 is a deficient number, since it is larger than the sum of its proper divisors (2967365).

121660243 is an equidigital number, since it uses as much as digits as its factorization.

121660243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967364.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 121660243 is about 11029.9702175482. The cubic root of 121660243 is about 495.5067327204.

The spelling of 121660243 in words is "one hundred twenty-one million, six hundred sixty thousand, two hundred forty-three".