121533 has 8 divisors (see below), whose sum is σ = 171648. Its totient is φ = 76224.

The previous prime is 121531. The next prime is 121547. The reversal of 121533 is 335121.

It is a happy number.

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

It is not a de Polignac number, because 121533 - 2¹ = 121531 is a prime.

It is an Ulam number.

121533 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121531) 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, 1141 + ... + 1242.

It is an arithmetic number, because the mean of its divisors is an integer number (21456).

2¹²¹⁵³³ is an apocalyptic number.

It is an amenable number.

121533 is a deficient number, since it is larger than the sum of its proper divisors (50115).

121533 is a wasteful number, since it uses less digits than its factorization.

121533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403.

The product of its digits is 90, while the sum is 15.

The square root of 121533 is about 348.6158344080. The cubic root of 121533 is about 49.5333924262.

Adding to 121533 its reverse (335121), we get a palindrome (456654).

The spelling of 121533 in words is "one hundred twenty-one thousand, five hundred thirty-three".