2123544636 has 36 divisors (see below), whose sum is σ = 5390330400. Its totient is φ = 704883648.

The previous prime is 2123544623. The next prime is 2123544659. The reversal of 2123544636 is 6364453212.

2123544636 is a `hidden beast` number, since 2 + 12 + 3 + 5 + 4 + 4 + 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 2123544636.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114801 + ... + 132008.

It is an arithmetic number, because the mean of its divisors is an integer number (149731400).

Almost surely, 2^2123544636 is an apocalyptic number.

It is an amenable number.

2123544636 is an abundant number, since it is smaller than the sum of its proper divisors (3266785764).

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

2123544636 is a wasteful number, since it uses less digits than its factorization.

2123544636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247058 (or 247053 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 2123544636 is about 46081.9339437919. The cubic root of 2123544636 is about 1285.3472262867.

Adding to 2123544636 its reverse (6364453212), we get a palindrome (8487997848).

The spelling of 2123544636 in words is "two billion, one hundred twenty-three million, five hundred forty-four thousand, six hundred thirty-six".