21114204436 has 24 divisors (see below), whose sum is σ = 40762698984. Its totient is φ = 9507333120.

The previous prime is 21114204361. The next prime is 21114204437. The reversal of 21114204436 is 63440241112.

It can be written as a sum of positive squares in 4 ways, for example, as 2495601936 + 18618602500 = 49956^2 + 136450^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114204437) 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 7 ways as a sum of consecutive naturals, for example, 4949605 + ... + 4953868.

It is an arithmetic number, because the mean of its divisors is an integer number (1698445791).

Almost surely, 2^21114204436 is an apocalyptic number.

21114204436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21114204436 is a deficient number, since it is larger than the sum of its proper divisors (19648494548).

21114204436 is a wasteful number, since it uses less digits than its factorization.

21114204436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9903531 (or 9903529 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21114204436 its reverse (63440241112), we get a palindrome (84554445548).

The spelling of 21114204436 in words is "twenty-one billion, one hundred fourteen million, two hundred four thousand, four hundred thirty-six".