133003421 has 2 divisors, whose sum is σ = 133003422. Its totient is φ = 133003420.

The previous prime is 133003399. The next prime is 133003463. The reversal of 133003421 is 124300331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108451396 + 24552025 = 10414^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 133003421 - 2⁶ = 133003357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 133003421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133003471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66501710 + 66501711.

It is an arithmetic number, because the mean of its divisors is an integer number (66501711).

Almost surely, 2^133003421 is an apocalyptic number.

It is an amenable number.

133003421 is a deficient number, since it is larger than the sum of its proper divisors (1).

133003421 is an equidigital number, since it uses as much as digits as its factorization.

133003421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 133003421 is about 11532.7109128773. The cubic root of 133003421 is about 510.4512487008.

Adding to 133003421 its reverse (124300331), we get a palindrome (257303752).

The spelling of 133003421 in words is "one hundred thirty-three million, three thousand, four hundred twenty-one".