21004636116426 has 16 divisors (see below), whose sum is σ = 44480405893824. Its totient is φ = 6589689761984.

The previous prime is 21004636116421. The next prime is 21004636116449. The reversal of 21004636116426 is 62461163640012.

It is not an unprimeable number, because it can be changed into a prime (21004636116421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102963902430 + ... + 102963902633.

It is an arithmetic number, because the mean of its divisors is an integer number (2780025368364).

Almost surely, 2^{21004636116426} is an apocalyptic number.

21004636116426 is an abundant number, since it is smaller than the sum of its proper divisors (23475769777398).

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

21004636116426 is a wasteful number, since it uses less digits than its factorization.

21004636116426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205927805085.

The product of its (nonzero) digits is 248832, while the sum is 42.

Adding to 21004636116426 its reverse (62461163640012), we get a palindrome (83465799756438).

The spelling of 21004636116426 in words is "twenty-one trillion, four billion, six hundred thirty-six million, one hundred sixteen thousand, four hundred twenty-six".