133555303421 has 2 divisors, whose sum is σ = 133555303422. Its totient is φ = 133555303420.

The previous prime is 133555303397. The next prime is 133555303459. The reversal of 133555303421 is 124303555331.

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., 69247922500 + 64307380921 = 263150^2 + 253589^2 .

It is a cyclic number.

It is not a de Polignac number, because 133555303421 - 2³⁴ = 116375434237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133555303471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66777651710 + 66777651711.

It is an arithmetic number, because the mean of its divisors is an integer number (66777651711).

Almost surely, 2^133555303421 is an apocalyptic number.

It is an amenable number.

133555303421 is a deficient number, since it is larger than the sum of its proper divisors (1).

133555303421 is an equidigital number, since it uses as much as digits as its factorization.

133555303421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 35.

Adding to 133555303421 its reverse (124303555331), we get a palindrome (257858858752).

The spelling of 133555303421 in words is "one hundred thirty-three billion, five hundred fifty-five million, three hundred three thousand, four hundred twenty-one".