33113023021 has 4 divisors (see below), whose sum is σ = 35660178652. Its totient is φ = 30565867392.

The previous prime is 33113023003. The next prime is 33113023037. The reversal of 33113023021 is 12032031133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12032031133 = 311 ⋅38688203.

It can be written as a sum of positive squares in 2 ways, for example, as 14258986921 + 18854036100 = 119411^2 + 137310^2 .

It is a cyclic number.

It is not a de Polignac number, because 33113023021 - 2¹¹ = 33113020973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33113023021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33113023001) 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, 1273577796 + ... + 1273577821.

It is an arithmetic number, because the mean of its divisors is an integer number (8915044663).

Almost surely, 2^33113023021 is an apocalyptic number.

It is an amenable number.

33113023021 is a deficient number, since it is larger than the sum of its proper divisors (2547155631).

33113023021 is a wasteful number, since it uses less digits than its factorization.

33113023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547155630.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 33113023021 its reverse (12032031133), we get a palindrome (45145054154).

The spelling of 33113023021 in words is "thirty-three billion, one hundred thirteen million, twenty-three thousand, twenty-one".