3918220213 has 2 divisors, whose sum is σ = 3918220214. Its totient is φ = 3918220212.

The previous prime is 3918220211. The next prime is 3918220217. The reversal of 3918220213 is 3120228193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2362154404 + 1556065809 = 48602^2 + 39447^2 .

It is an emirp because it is prime and its reverse (3120228193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3918220213 - 2¹ = 3918220211 is a prime.

Together with 3918220211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3918220211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1959110106 + 1959110107.

It is an arithmetic number, because the mean of its divisors is an integer number (1959110107).

Almost surely, 2^3918220213 is an apocalyptic number.

It is an amenable number.

3918220213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3918220213 is an equidigital number, since it uses as much as digits as its factorization.

3918220213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 3918220213 is about 62595.6884537585. The cubic root of 3918220213 is about 1576.5083677668.

It can be divided in two parts, 39182 and 20213, that added together give a palindrome (59395).

The spelling of 3918220213 in words is "three billion, nine hundred eighteen million, two hundred twenty thousand, two hundred thirteen".