21234628644309 has 48 divisors (see below), whose sum is σ = 33655853940800. Its totient is φ = 13341855015936.

The previous prime is 21234628644287. The next prime is 21234628644377. The reversal of 21234628644309 is 90344682643212.

21234628644309 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 4 + 628 + 6 + 4 + 4 + 3 + 0 + 9 = 666.

It is not a de Polignac number, because 21234628644309 - 2⁷ = 21234628644181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234628644379) 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 47 ways as a sum of consecutive naturals, for example, 11024014 + ... + 12806175.

Almost surely, 2^{21234628644309} is an apocalyptic number.

It is an amenable number.

21234628644309 is a deficient number, since it is larger than the sum of its proper divisors (12421225296491).

21234628644309 is a wasteful number, since it uses less digits than its factorization.

21234628644309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23830416 (or 23830404 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 54.

The spelling of 21234628644309 in words is "twenty-one trillion, two hundred thirty-four billion, six hundred twenty-eight million, six hundred forty-four thousand, three hundred nine".