2221312220 has 12 divisors (see below), whose sum is σ = 4664755704. Its totient is φ = 888524880.

The previous prime is 2221312153. The next prime is 2221312229. The reversal of 2221312220 is 222131222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221312229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55532786 + ... + 55532825.

It is an arithmetic number, because the mean of its divisors is an integer number (388729642).

Almost surely, 2^2221312220 is an apocalyptic number.

2221312220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221312220 is an abundant number, since it is smaller than the sum of its proper divisors (2443443484).

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

2221312220 is a wasteful number, since it uses less digits than its factorization.

2221312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111065620 (or 111065618 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2221312220 is about 47130.7990596383. The cubic root of 2221312220 is about 1304.7777291570. Note that the first 4 decimals are identical.

Adding to 2221312220 its reverse (222131222), we get a palindrome (2443443442).

The spelling of 2221312220 in words is "two billion, two hundred twenty-one million, three hundred twelve thousand, two hundred twenty".