133433021 has 4 divisors (see below), whose sum is σ = 137737344. Its totient is φ = 129128700.

The previous prime is 133433009. The next prime is 133433039. The reversal of 133433021 is 120334331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133433021 - 2¹⁴ = 133416637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133432984 and 133433002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133433071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2152115 + ... + 2152176.

It is an arithmetic number, because the mean of its divisors is an integer number (34434336).

Almost surely, 2^133433021 is an apocalyptic number.

It is an amenable number.

133433021 is a deficient number, since it is larger than the sum of its proper divisors (4304323).

133433021 is an equidigital number, since it uses as much as digits as its factorization.

133433021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4304322.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 133433021 is about 11551.3211798478. The cubic root of 133433021 is about 511.0002425439. Note that the first 3 decimals are identical.

Adding to 133433021 its reverse (120334331), we get a palindrome (253767352).

The spelling of 133433021 in words is "one hundred thirty-three million, four hundred thirty-three thousand, twenty-one".