2221528204 has 12 divisors (see below), whose sum is σ = 4443056464. Its totient is φ = 952083504.

The previous prime is 2221528181. The next prime is 2221528207. The reversal of 2221528204 is 4028251222.

2221528204 is an admirable number.

It is a super-2 number, since 2×2221528204² = 9870375122334931232, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 79340293 = 2221528204 / (2 + 2 + 2 + 1 + 5 + 2 + 8 + 2 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (2221528207) 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, 39670119 + ... + 39670174.

Almost surely, 2^2221528204 is an apocalyptic number.

It is an amenable number.

2221528204 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2221528204 is a wasteful number, since it uses less digits than its factorization.

2221528204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79340304 (or 79340302 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 2221528204 is about 47133.0903294066. The cubic root of 2221528204 is about 1304.8200167708.

Adding to 2221528204 its reverse (4028251222), we get a palindrome (6249779426).

The spelling of 2221528204 in words is "two billion, two hundred twenty-one million, five hundred twenty-eight thousand, two hundred four".