33121121 has 4 divisors (see below), whose sum is σ = 36132144. Its totient is φ = 30110100.

The previous prime is 33121097. The next prime is 33121129. The reversal of 33121121 is 12112133.

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: 12112133 = 11 ⋅1101103.

It is a cyclic number.

It is not a de Polignac number, because 33121121 - 2¹⁴ = 33104737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33121096 and 33121105.

It is not an unprimeable number, because it can be changed into a prime (33121129) 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, 1505495 + ... + 1505516.

It is an arithmetic number, because the mean of its divisors is an integer number (9033036).

Almost surely, 2^33121121 is an apocalyptic number.

It is an amenable number.

33121121 is a deficient number, since it is larger than the sum of its proper divisors (3011023).

33121121 is a wasteful number, since it uses less digits than its factorization.

33121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011022.

The product of its digits is 36, while the sum is 14.

The square root of 33121121 is about 5755.0952207587. The cubic root of 33121121 is about 321.1453778728.

Adding to 33121121 its reverse (12112133), we get a palindrome (45233254).

It can be divided in two parts, 33 and 121121, that multiplied together give a palindrome (3996993).

The spelling of 33121121 in words is "thirty-three million, one hundred twenty-one thousand, one hundred twenty-one".