421545133 has 2 divisors, whose sum is σ = 421545134. Its totient is φ = 421545132.

The previous prime is 421545119. The next prime is 421545139. The reversal of 421545133 is 331545124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290259369 + 131285764 = 17037^2 + 11458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421545133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421545139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210772566 + 210772567.

It is an arithmetic number, because the mean of its divisors is an integer number (210772567).

Almost surely, 2^421545133 is an apocalyptic number.

It is an amenable number.

421545133 is a deficient number, since it is larger than the sum of its proper divisors (1).

421545133 is an equidigital number, since it uses as much as digits as its factorization.

421545133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 28.

The square root of 421545133 is about 20531.5643096185. The cubic root of 421545133 is about 749.8044722889.

Subtracting from 421545133 its reverse (331545124), we obtain a palindrome (90000009).

The spelling of 421545133 in words is "four hundred twenty-one million, five hundred forty-five thousand, one hundred thirty-three".