3618900221 has 2 divisors, whose sum is σ = 3618900222. Its totient is φ = 3618900220.

The previous prime is 3618900203. The next prime is 3618900223. The reversal of 3618900221 is 1220098163.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3503337721 + 115562500 = 59189^2 + 10750^2 .

It is an emirp because it is prime and its reverse (1220098163) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3618900221 - 2¹⁴ = 3618883837 is a prime.

Together with 3618900223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3618900223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1809450110 + 1809450111.

It is an arithmetic number, because the mean of its divisors is an integer number (1809450111).

Almost surely, 2^3618900221 is an apocalyptic number.

It is an amenable number.

3618900221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3618900221 is an equidigital number, since it uses as much as digits as its factorization.

3618900221 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 32.

The square root of 3618900221 is about 60157.2956589639. The cubic root of 3618900221 is about 1535.2962990499.

Adding to 3618900221 its reverse (1220098163), we get a palindrome (4838998384).

The spelling of 3618900221 in words is "three billion, six hundred eighteen million, nine hundred thousand, two hundred twenty-one".