21643224363436 has 96 divisors (see below), whose sum is σ = 45410300103168. Its totient is φ = 8924168647680.

The previous prime is 21643224363389. The next prime is 21643224363503. The reversal of 21643224363436 is 63436342234612.

It is a self number, because there is not a number n which added to its sum of digits gives 21643224363436.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1399450 + ... + 6726433.

It is an arithmetic number, because the mean of its divisors is an integer number (473023959408).

Almost surely, 2^{21643224363436} is an apocalyptic number.

21643224363436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21643224363436 is an abundant number, since it is smaller than the sum of its proper divisors (23767075739732).

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

21643224363436 is a wasteful number, since it uses less digits than its factorization.

21643224363436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8126071 (or 8126069 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 49.

The spelling of 21643224363436 in words is "twenty-one trillion, six hundred forty-three billion, two hundred twenty-four million, three hundred sixty-three thousand, four hundred thirty-six".