33130021 has 4 divisors (see below), whose sum is σ = 33252544. Its totient is φ = 33007500.

The previous prime is 33130003. The next prime is 33130039. The reversal of 33130021 is 12003133.

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 an interprime number because it is at equal distance from previous prime (33130003) and next prime (33130039).

It is a cyclic number.

It is not a de Polignac number, because 33130021 - 2¹¹ = 33127973 is a prime.

It is a super-3 number, since 3×33130021³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33129983 and 33130010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33130061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60855 + ... + 61396.

It is an arithmetic number, because the mean of its divisors is an integer number (8313136).

Almost surely, 2^33130021 is an apocalyptic number.

It is an amenable number.

33130021 is a deficient number, since it is larger than the sum of its proper divisors (122523).

33130021 is a wasteful number, since it uses less digits than its factorization.

33130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122522.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 33130021 is about 5755.8683966887. The cubic root of 33130021 is about 321.1741403644.

Adding to 33130021 its reverse (12003133), we get a palindrome (45133154).

The spelling of 33130021 in words is "thirty-three million, one hundred thirty thousand, twenty-one".