3621013221 has 12 divisors (see below), whose sum is σ = 5616265632. Its totient is φ = 2069150328.

The previous prime is 3621013213. The next prime is 3621013223. The reversal of 3621013221 is 1223101263.

It is not a de Polignac number, because 3621013221 - 2³ = 3621013213 is a prime.

It is a super-3 number, since 3×3621013221³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621013223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12316225 + ... + 12316518.

It is an arithmetic number, because the mean of its divisors is an integer number (468022136).

Almost surely, 2^3621013221 is an apocalyptic number.

It is an amenable number.

3621013221 is a deficient number, since it is larger than the sum of its proper divisors (1995252411).

3621013221 is a wasteful number, since it uses less digits than its factorization.

3621013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24632760 (or 24632753 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 3621013221 is about 60174.8553882766. The cubic root of 3621013221 is about 1535.5950500242.

Adding to 3621013221 its reverse (1223101263), we get a palindrome (4844114484).

The spelling of 3621013221 in words is "three billion, six hundred twenty-one million, thirteen thousand, two hundred twenty-one".