3615222221 has 16 divisors (see below), whose sum is σ = 3935895600. Its totient is φ = 3300756480.

The previous prime is 3615222217. The next prime is 3615222223. The reversal of 3615222221 is 1222225163.

It can be written as a sum of positive squares in 8 ways, for example, as 685706596 + 2929515625 = 26186^2 + 54125^2 .

It is a cyclic number.

It is not a de Polignac number, because 3615222221 - 2² = 3615222217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3615222223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792455 + ... + 797003.

It is an arithmetic number, because the mean of its divisors is an integer number (245993475).

Almost surely, 2^3615222221 is an apocalyptic number.

It is an amenable number.

3615222221 is a deficient number, since it is larger than the sum of its proper divisors (320673379).

3615222221 is a wasteful number, since it uses less digits than its factorization.

3615222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5216.

The product of its digits is 2880, while the sum is 26.

The square root of 3615222221 is about 60126.7180295083. The cubic root of 3615222221 is about 1534.7759997383.

Adding to 3615222221 its reverse (1222225163), we get a palindrome (4837447384).

The spelling of 3615222221 in words is "three billion, six hundred fifteen million, two hundred twenty-two thousand, two hundred twenty-one".