133012421 has 2 divisors, whose sum is σ = 133012422. Its totient is φ = 133012420.

The previous prime is 133012417. The next prime is 133012433. The reversal of 133012421 is 124210331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113529025 + 19483396 = 10655^2 + 4414^2 .

It is a cyclic number.

It is not a de Polignac number, because 133012421 - 2² = 133012417 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 133012421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133012721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66506210 + 66506211.

It is an arithmetic number, because the mean of its divisors is an integer number (66506211).

Almost surely, 2^133012421 is an apocalyptic number.

It is an amenable number.

133012421 is a deficient number, since it is larger than the sum of its proper divisors (1).

133012421 is an equidigital number, since it uses as much as digits as its factorization.

133012421 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 133012421 is about 11533.1011007448. The cubic root of 133012421 is about 510.4627620829.

Adding to 133012421 its reverse (124210331), we get a palindrome (257222752).

The spelling of 133012421 in words is "one hundred thirty-three million, twelve thousand, four hundred twenty-one".