133210421 has 2 divisors, whose sum is σ = 133210422. Its totient is φ = 133210420.

The previous prime is 133210409. The next prime is 133210477. The reversal of 133210421 is 124012331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99221521 + 33988900 = 9961^2 + 5830^2 .

It is a cyclic number.

It is not a de Polignac number, because 133210421 - 2¹⁰ = 133209397 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133210421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133210481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66605210 + 66605211.

It is an arithmetic number, because the mean of its divisors is an integer number (66605211).

Almost surely, 2^133210421 is an apocalyptic number.

It is an amenable number.

133210421 is a deficient number, since it is larger than the sum of its proper divisors (1).

133210421 is an equidigital number, since it uses as much as digits as its factorization.

133210421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 133210421 is about 11541.6818965002. The cubic root of 133210421 is about 510.7159251996.

Adding to 133210421 its reverse (124012331), we get a palindrome (257222752).

The spelling of 133210421 in words is "one hundred thirty-three million, two hundred ten thousand, four hundred twenty-one".