21365633100436 has 12 divisors (see below), whose sum is σ = 37393839448000. Its totient is φ = 10681678972440.

The previous prime is 21365633100421. The next prime is 21365633100439. The reversal of 21365633100436 is 63400133656312.

It is a junction number, because it is equal to n+sod(n) for n = 21365633100392 and 21365633100401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365633100439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284352186 + ... + 284427313.

Almost surely, 2^{21365633100436} is an apocalyptic number.

It is an amenable number.

21365633100436 is a deficient number, since it is larger than the sum of its proper divisors (16028206347564).

21365633100436 is a wasteful number, since it uses less digits than its factorization.

21365633100436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568788894 (or 568788892 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 43.

Adding to 21365633100436 its reverse (63400133656312), we get a palindrome (84765766756748).

The spelling of 21365633100436 in words is "twenty-one trillion, three hundred sixty-five billion, six hundred thirty-three million, one hundred thousand, four hundred thirty-six".