33530221213 has 4 divisors (see below), whose sum is σ = 33534677500. Its totient is φ = 33525764928.

The previous prime is 33530221189. The next prime is 33530221217. The reversal of 33530221213 is 31212203533.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31212203533 = 7 ⋅4458886219.

It can be written as a sum of positive squares in 2 ways, for example, as 5588758564 + 27941462649 = 74758^2 + 167157^2 .

It is a cyclic number.

It is not a de Polignac number, because 33530221213 - 2⁵ = 33530221181 is a prime.

It is a super-2 number, since 2×33530221213² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33530221217) 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, 2216838 + ... + 2231911.

It is an arithmetic number, because the mean of its divisors is an integer number (8383669375).

Almost surely, 2^33530221213 is an apocalyptic number.

It is an amenable number.

33530221213 is a deficient number, since it is larger than the sum of its proper divisors (4456287).

33530221213 is an equidigital number, since it uses as much as digits as its factorization.

33530221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4456286.

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 33530221213 its reverse (31212203533), we get a palindrome (64742424746).

The spelling of 33530221213 in words is "thirty-three billion, five hundred thirty million, two hundred twenty-one thousand, two hundred thirteen".