133421243 has 4 divisors (see below), whose sum is σ = 135682680. Its totient is φ = 131159808.

The previous prime is 133421227. The next prime is 133421251. The reversal of 133421243 is 342124331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342124331 = 653 ⋅523927.

It is a cyclic number.

It is not a de Polignac number, because 133421243 - 2⁴ = 133421227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133421263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1130630 + ... + 1130747.

It is an arithmetic number, because the mean of its divisors is an integer number (33920670).

Almost surely, 2^133421243 is an apocalyptic number.

133421243 is a deficient number, since it is larger than the sum of its proper divisors (2261437).

133421243 is an equidigital number, since it uses as much as digits as its factorization.

133421243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261436.

The product of its digits is 1728, while the sum is 23.

The square root of 133421243 is about 11550.8113567836. The cubic root of 133421243 is about 510.9852069405.

Adding to 133421243 its reverse (342124331), we get a palindrome (475545574).

The spelling of 133421243 in words is "one hundred thirty-three million, four hundred twenty-one thousand, two hundred forty-three".