33011221013 has 4 divisors (see below), whose sum is σ = 33098322240. Its totient is φ = 32924119788.

The previous prime is 33011220989. The next prime is 33011221079. The reversal of 33011221013 is 31012211033.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31012211033 = 7559 ⋅4102687.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33011221013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 33011220982 and 33011221000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33011221093) 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, 43550045 + ... + 43550802.

It is an arithmetic number, because the mean of its divisors is an integer number (8274580560).

Almost surely, 2^33011221013 is an apocalyptic number.

It is an amenable number.

33011221013 is a deficient number, since it is larger than the sum of its proper divisors (87101227).

33011221013 is an equidigital number, since it uses as much as digits as its factorization.

33011221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87101226.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 33011221013 its reverse (31012211033), we get a palindrome (64023432046).

The spelling of 33011221013 in words is "thirty-three billion, eleven million, two hundred twenty-one thousand, thirteen".