2221635636 has 36 divisors (see below), whose sum is σ = 6126329664. Its totient is φ = 673222800.

The previous prime is 2221635593. The next prime is 2221635643. The reversal of 2221635636 is 6365361222.

2221635636 is a `hidden beast` number, since 2 + 2 + 2 + 16 + 3 + 5 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2221635636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2804700 + ... + 2805491.

It is an arithmetic number, because the mean of its divisors is an integer number (170175824).

Almost surely, 2^2221635636 is an apocalyptic number.

It is an amenable number.

2221635636 is an abundant number, since it is smaller than the sum of its proper divisors (3904694028).

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

2221635636 is a wasteful number, since it uses less digits than its factorization.

2221635636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5610212 (or 5610207 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 2221635636 is about 47134.2299820417. The cubic root of 2221635636 is about 1304.8410499143.

Adding to 2221635636 its reverse (6365361222), we get a palindrome (8586996858).

The spelling of 2221635636 in words is "two billion, two hundred twenty-one million, six hundred thirty-five thousand, six hundred thirty-six".