33031213213 has 2 divisors, whose sum is σ = 33031213214. Its totient is φ = 33031213212.

The previous prime is 33031213147. The next prime is 33031213219. The reversal of 33031213213 is 31231213033.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25053508089 + 7977705124 = 158283^2 + 89318^2 .

It is an emirp because it is prime and its reverse (31231213033) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33031213213 - 2²¹ = 33029116061 is a prime.

It is a super-2 number, since 2×33031213213² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33031213219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16515606606 + 16515606607.

It is an arithmetic number, because the mean of its divisors is an integer number (16515606607).

Almost surely, 2^33031213213 is an apocalyptic number.

It is an amenable number.

33031213213 is a deficient number, since it is larger than the sum of its proper divisors (1).

33031213213 is an equidigital number, since it uses as much as digits as its factorization.

33031213213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 33031213213 its reverse (31231213033), we get a palindrome (64262426246).

The spelling of 33031213213 in words is "thirty-three billion, thirty-one million, two hundred thirteen thousand, two hundred thirteen".