133747021 has 2 divisors, whose sum is σ = 133747022. Its totient is φ = 133747020.

The previous prime is 133747013. The next prime is 133747039. The reversal of 133747021 is 120747331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99102025 + 34644996 = 9955^2 + 5886^2 .

It is an emirp because it is prime and its reverse (120747331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133747021 - 2³ = 133747013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133747121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66873510 + 66873511.

It is an arithmetic number, because the mean of its divisors is an integer number (66873511).

Almost surely, 2^133747021 is an apocalyptic number.

It is an amenable number.

133747021 is a deficient number, since it is larger than the sum of its proper divisors (1).

133747021 is an equidigital number, since it uses as much as digits as its factorization.

133747021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 133747021 is about 11564.9047121020. The cubic root of 133747021 is about 511.4007640362.

The spelling of 133747021 in words is "one hundred thirty-three million, seven hundred forty-seven thousand, twenty-one".