33130010021 has 4 divisors (see below), whose sum is σ = 33149534412. Its totient is φ = 33110485632.

The previous prime is 33130010009. The next prime is 33130010029. The reversal of 33130010021 is 12001003133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12001003133 = 7 ⋅1714429019.

It can be written as a sum of positive squares in 2 ways, for example, as 32719744996 + 410265025 = 180886^2 + 20255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33130010021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33130009978 and 33130010005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33130010029) 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, 9759650 + ... + 9763043.

It is an arithmetic number, because the mean of its divisors is an integer number (8287383603).

Almost surely, 2^33130010021 is an apocalyptic number.

It is an amenable number.

33130010021 is a deficient number, since it is larger than the sum of its proper divisors (19524391).

33130010021 is a wasteful number, since it uses less digits than its factorization.

33130010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19524390.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 33130010021 its reverse (12001003133), we get a palindrome (45131013154).

The spelling of 33130010021 in words is "thirty-three billion, one hundred thirty million, ten thousand, twenty-one".