121312133 has 4 divisors (see below), whose sum is σ = 125495340. Its totient is φ = 117128928.

The previous prime is 121312109. The next prime is 121312141. The reversal of 121312133 is 331213121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 331213121 = 2039 ⋅162439.

It can be written as a sum of positive squares in 2 ways, for example, as 30052324 + 91259809 = 5482^2 + 9553^2 .

It is a cyclic number.

It is not a de Polignac number, because 121312133 - 2⁶ = 121312069 is a prime.

It is a super-2 number, since 2×121312133² = 29433267226019378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312183) 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, 2091560 + ... + 2091617.

It is an arithmetic number, because the mean of its divisors is an integer number (31373835).

Almost surely, 2^121312133 is an apocalyptic number.

It is an amenable number.

121312133 is a deficient number, since it is larger than the sum of its proper divisors (4183207).

121312133 is an equidigital number, since it uses as much as digits as its factorization.

121312133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4183206.

The product of its digits is 108, while the sum is 17.

The square root of 121312133 is about 11014.1787256245. The cubic root of 121312133 is about 495.0336786254.

Adding to 121312133 its reverse (331213121), we get a palindrome (452525254).

The spelling of 121312133 in words is "one hundred twenty-one million, three hundred twelve thousand, one hundred thirty-three".