121533943 has 4 divisors (see below), whose sum is σ = 121851648. Its totient is φ = 121216240.

The previous prime is 121533911. The next prime is 121533947. The reversal of 121533943 is 349335121.

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 121533943 - 2⁵ = 121533911 is a prime.

It is a super-2 number, since 2×121533943² = 29540998602254498, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121533947) 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, 158278 + ... + 159043.

It is an arithmetic number, because the mean of its divisors is an integer number (30462912).

Almost surely, 2^121533943 is an apocalyptic number.

121533943 is a deficient number, since it is larger than the sum of its proper divisors (317705).

121533943 is an equidigital number, since it uses as much as digits as its factorization.

121533943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317704.

The product of its digits is 9720, while the sum is 31.

The square root of 121533943 is about 11024.2434207523. The cubic root of 121533943 is about 495.3352053924.

The spelling of 121533943 in words is "one hundred twenty-one million, five hundred thirty-three thousand, nine hundred forty-three".