2218634220 has 72 divisors (see below), whose sum is σ = 6828281712. Its totient is φ = 537848960.

The previous prime is 2218634153. The next prime is 2218634261. The reversal of 2218634220 is 224368122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145539 + ... + 160058.

It is an arithmetic number, because the mean of its divisors is an integer number (94837246).

Almost surely, 2^2218634220 is an apocalyptic number.

2218634220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2218634220 is an abundant number, since it is smaller than the sum of its proper divisors (4609647492).

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

2218634220 is a wasteful number, since it uses less digits than its factorization.

2218634220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305631 (or 305618 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 2218634220 is about 47102.3801946356. The cubic root of 2218634220 is about 1304.2531743674.

The spelling of 2218634220 in words is "two billion, two hundred eighteen million, six hundred thirty-four thousand, two hundred twenty".