33113021 has 2 divisors, whose sum is σ = 33113022. Its totient is φ = 33113020.

The previous prime is 33113011. The next prime is 33113023. The reversal of 33113021 is 12031133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25351225 + 7761796 = 5035^2 + 2786^2 .

It is an emirp because it is prime and its reverse (12031133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33113021 is a prime.

Together with 33113023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 33112987 and 33113005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33113023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16556510 + 16556511.

It is an arithmetic number, because the mean of its divisors is an integer number (16556511).

Almost surely, 2^33113021 is an apocalyptic number.

It is an amenable number.

33113021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33113021 is an equidigital number, since it uses as much as digits as its factorization.

33113021 is an evil number, because the sum of its binary digits is even.

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

The square root of 33113021 is about 5754.3914534901. The cubic root of 33113021 is about 321.1191962948.

Adding to 33113021 its reverse (12031133), we get a palindrome (45144154).

The spelling of 33113021 in words is "thirty-three million, one hundred thirteen thousand, twenty-one".