2218045221 has 96 divisors (see below), whose sum is σ = 3955015680. Its totient is φ = 1224230112.

The previous prime is 2218045201. The next prime is 2218045229. The reversal of 2218045221 is 1225408122.

It is not a de Polignac number, because 2218045221 - 2⁵ = 2218045189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218045229) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7224750 + ... + 7225056.

It is an arithmetic number, because the mean of its divisors is an integer number (41198080).

Almost surely, 2^2218045221 is an apocalyptic number.

2218045221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2218045221 is a deficient number, since it is larger than the sum of its proper divisors (1736970459).

2218045221 is a wasteful number, since it uses less digits than its factorization.

2218045221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 2218045221 is about 47096.1274522651. The cubic root of 2218045221 is about 1304.1377472277.

The spelling of 2218045221 in words is "two billion, two hundred eighteen million, forty-five thousand, two hundred twenty-one".