133164021 has 4 divisors (see below), whose sum is σ = 177552032. Its totient is φ = 88776012.

The previous prime is 133164011. The next prime is 133164029. The reversal of 133164021 is 120461331.

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 not a de Polignac number, because 133164021 - 2⁶ = 133163957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133164029) 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, 22194001 + ... + 22194006.

It is an arithmetic number, because the mean of its divisors is an integer number (44388008).

Almost surely, 2^133164021 is an apocalyptic number.

It is an amenable number.

133164021 is a deficient number, since it is larger than the sum of its proper divisors (44388011).

133164021 is an equidigital number, since it uses as much as digits as its factorization.

133164021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44388010.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 133164021 is about 11539.6716157783. The cubic root of 133164021 is about 510.6566206029.

The spelling of 133164021 in words is "one hundred thirty-three million, one hundred sixty-four thousand, twenty-one".