2221539944 has 32 divisors (see below), whose sum is σ = 4570450920. Its totient is φ = 1005977856.

The previous prime is 2221539919. The next prime is 2221539959. The reversal of 2221539944 is 4499351222.

It can be written as a sum of positive squares in 4 ways, for example, as 2118760900 + 102779044 = 46030^2 + 10138^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196007 + ... + 207030.

Almost surely, 2^2221539944 is an apocalyptic number.

It is an amenable number.

2221539944 is an abundant number, since it is smaller than the sum of its proper divisors (2348910976).

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

2221539944 is a wasteful number, since it uses less digits than its factorization.

2221539944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403109 (or 403105 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 2221539944 is about 47133.2148701953. The cubic root of 2221539944 is about 1304.8223152727.

The spelling of 2221539944 in words is "two billion, two hundred twenty-one million, five hundred thirty-nine thousand, nine hundred forty-four".