2221787220 has 48 divisors (see below), whose sum is σ = 6225569280. Its totient is φ = 592041856.

The previous prime is 2221787219. The next prime is 2221787261. The reversal of 2221787220 is 227871222.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 73474 + ... + 99206.

It is an arithmetic number, because the mean of its divisors is an integer number (129699360).

Almost surely, 2^2221787220 is an apocalyptic number.

2221787220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221787220 is an abundant number, since it is smaller than the sum of its proper divisors (4003782060).

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

2221787220 is a wasteful number, since it uses less digits than its factorization.

2221787220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27184 (or 27182 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 2221787220 is about 47135.8379579699. The cubic root of 2221787220 is about 1304.8707260268.

The spelling of 2221787220 in words is "two billion, two hundred twenty-one million, seven hundred eighty-seven thousand, two hundred twenty".