2221618752 has 196 divisors, whose sum is σ = 7001071596. Its totient is φ = 696729600.

The previous prime is 2221618733. The next prime is 2221618799. The reversal of 2221618752 is 2578161222.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1445216256 + 776402496 = 38016^2 + 27864^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 791752 + ... + 794552.

Almost surely, 2^2221618752 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 2221618752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3500535798).

2221618752 is an abundant number, since it is smaller than the sum of its proper divisors (4779452844).

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

2221618752 is an equidigital number, since it uses as much as digits as its factorization.

2221618752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848 (or 2823 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 2221618752 is about 47134.0508761978. The cubic root of 2221618752 is about 1304.8377443930.

Adding to 2221618752 its reverse (2578161222), we get a palindrome (4799779974).

The spelling of 2221618752 in words is "two billion, two hundred twenty-one million, six hundred eighteen thousand, seven hundred fifty-two".