133340021 has 8 divisors (see below), whose sum is σ = 137793024. Its totient is φ = 128896560.

The previous prime is 133340017. The next prime is 133340023. The reversal of 133340021 is 120043331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133340021 - 2² = 133340017 is a prime.

It is a super-2 number, since 2×133340021² = 35559122400560882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133340023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36155 + ... + 39671.

It is an arithmetic number, because the mean of its divisors is an integer number (17224128).

Almost surely, 2^133340021 is an apocalyptic number.

It is an amenable number.

133340021 is a deficient number, since it is larger than the sum of its proper divisors (4453003).

133340021 is a wasteful number, since it uses less digits than its factorization.

133340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4771.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 133340021 is about 11547.2949646227. The cubic root of 133340021 is about 510.8814961563.

Adding to 133340021 its reverse (120043331), we get a palindrome (253383352).

The spelling of 133340021 in words is "one hundred thirty-three million, three hundred forty thousand, twenty-one".