121333521 has 4 divisors (see below), whose sum is σ = 161778032. Its totient is φ = 80889012.

The previous prime is 121333507. The next prime is 121333523. The reversal of 121333521 is 125333121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125333121 = 3 ⋅41777707.

It is not a de Polignac number, because 121333521 - 2⁵ = 121333489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121333523) 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, 20222251 + ... + 20222256.

It is an arithmetic number, because the mean of its divisors is an integer number (40444508).

Almost surely, 2^121333521 is an apocalyptic number.

It is an amenable number.

121333521 is a deficient number, since it is larger than the sum of its proper divisors (40444511).

121333521 is an equidigital number, since it uses as much as digits as its factorization.

121333521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40444510.

The product of its digits is 540, while the sum is 21.

The square root of 121333521 is about 11015.1496131464. The cubic root of 121333521 is about 495.0627693077.

Adding to 121333521 its reverse (125333121), we get a palindrome (246666642).

The spelling of 121333521 in words is "one hundred twenty-one million, three hundred thirty-three thousand, five hundred twenty-one".