2216821558 has 16 divisors (see below), whose sum is σ = 3965495040. Its totient is φ = 908759016.

The previous prime is 2216821543. The next prime is 2216821559. The reversal of 2216821558 is 8551286122.

It is a self number, because there is not a number n which added to its sum of digits gives 2216821558.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216821559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3441948 + ... + 3442591.

It is an arithmetic number, because the mean of its divisors is an integer number (247843440).

Almost surely, 2^2216821558 is an apocalyptic number.

2216821558 is a deficient number, since it is larger than the sum of its proper divisors (1748673482).

2216821558 is a wasteful number, since it uses less digits than its factorization.

2216821558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6884571.

The product of its digits is 76800, while the sum is 40.

The square root of 2216821558 is about 47083.1345388134. The cubic root of 2216821558 is about 1303.8978785591.

The spelling of 2216821558 in words is "two billion, two hundred sixteen million, eight hundred twenty-one thousand, five hundred fifty-eight".