2216221787988 has 96 divisors (see below), whose sum is σ = 6196471948800. Its totient is φ = 680952292992.

The previous prime is 2216221787987. The next prime is 2216221788037. The reversal of 2216221787988 is 8897871226122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216221787987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117756 + ... + 2108627.

It is an arithmetic number, because the mean of its divisors is an integer number (64546582800).

Almost surely, 2^{2216221787988} 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 2216221787988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3098235974400).

2216221787988 is an abundant number, since it is smaller than the sum of its proper divisors (3980250160812).

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

2216221787988 is a wasteful number, since it uses less digits than its factorization.

2216221787988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227118 (or 2227110 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 63.

The spelling of 2216221787988 in words is "two trillion, two hundred sixteen billion, two hundred twenty-one million, seven hundred eighty-seven thousand, nine hundred eighty-eight".