2217221616 has 80 divisors (see below), whose sum is σ = 5992616448. Its totient is φ = 705676800.

The previous prime is 2217221603. The next prime is 2217221621. The reversal of 2217221616 is 6161227122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80511 + ... + 104481.

Almost surely, 2^2217221616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2217221616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2996308224).

2217221616 is an abundant number, since it is smaller than the sum of its proper divisors (3775394832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2217221616 is a wasteful number, since it uses less digits than its factorization.

2217221616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24070 (or 24064 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 2217221616 is about 47087.3827686356. The cubic root of 2217221616 is about 1303.9763096804.

Adding to 2217221616 its reverse (6161227122), we get a palindrome (8378448738).

The spelling of 2217221616 in words is "two billion, two hundred seventeen million, two hundred twenty-one thousand, six hundred sixteen".