2221505220 has 48 divisors (see below), whose sum is σ = 6785690688. Its totient is φ = 538546560.

The previous prime is 2221505189. The next prime is 2221505227. The reversal of 2221505220 is 225051222.

It is not an unprimeable number, because it can be changed into a prime (2221505227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1682299 + ... + 1683618.

It is an arithmetic number, because the mean of its divisors is an integer number (141368556).

Almost surely, 2^2221505220 is an apocalyptic number.

2221505220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221505220 is an abundant number, since it is smaller than the sum of its proper divisors (4564185468).

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

2221505220 is a wasteful number, since it uses less digits than its factorization.

2221505220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365940 (or 3365938 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 2221505220 is about 47132.8465085656. The cubic root of 2221505220 is about 1304.8155168525.

Adding to 2221505220 its reverse (225051222), we get a palindrome (2446556442).

The spelling of 2221505220 in words is "two billion, two hundred twenty-one million, five hundred five thousand, two hundred twenty".