2221642836 has 96 divisors (see below), whose sum is σ = 6591200000. Its totient is φ = 633930624.

The previous prime is 2221642751. The next prime is 2221642873. The reversal of 2221642836 is 6382461222.

2221642836 is a `hidden beast` number, since 2 + 2 + 2 + 1 + 642 + 8 + 3 + 6 = 666.

It is a super-4 number, since 4×2221642836⁴ (a number of 38 digits) contains 4444 as substring.

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 2221642836.

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 31 ways as a sum of consecutive naturals, for example, 806790 + ... + 809538.

Almost surely, 2^2221642836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221642836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3295600000).

2221642836 is an abundant number, since it is smaller than the sum of its proper divisors (4369557164).

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

2221642836 is a wasteful number, since it uses less digits than its factorization.

2221642836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3838 (or 3830 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 2221642836 is about 47134.3063595933. The cubic root of 2221642836 is about 1304.8424595132.

The spelling of 2221642836 in words is "two billion, two hundred twenty-one million, six hundred forty-two thousand, eight hundred thirty-six".