133313021 has 4 divisors (see below), whose sum is σ = 133340892. Its totient is φ = 133285152.

The previous prime is 133312957. The next prime is 133313057. The reversal of 133313021 is 120313331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70744921 + 62568100 = 8411^2 + 7910^2 .

It is a cyclic number.

It is not a de Polignac number, because 133313021 - 2⁶ = 133312957 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 (133313321) 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, 4736 + ... + 17001.

It is an arithmetic number, because the mean of its divisors is an integer number (33335223).

Almost surely, 2^133313021 is an apocalyptic number.

It is an amenable number.

133313021 is a deficient number, since it is larger than the sum of its proper divisors (27871).

133313021 is an equidigital number, since it uses as much as digits as its factorization.

133313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27870.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 133313021 is about 11546.1258004579. The cubic root of 133313021 is about 510.8470110572.

Adding to 133313021 its reverse (120313331), we get a palindrome (253626352).

The spelling of 133313021 in words is "one hundred thirty-three million, three hundred thirteen thousand, twenty-one".