21144823838406 has 12 divisors (see below), whose sum is σ = 45813784983252. Its totient is φ = 7048274612796.

The previous prime is 21144823838353. The next prime is 21144823838407. The reversal of 21144823838406 is 60483832844112.

21144823838406 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 482 + 3 + 83 + 84 + 0 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144823838407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 587356217716 + ... + 587356217751.

It is an arithmetic number, because the mean of its divisors is an integer number (3817815415271).

Almost surely, 2^{21144823838406} is an apocalyptic number.

21144823838406 is an abundant number, since it is smaller than the sum of its proper divisors (24668961144846).

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

21144823838406 is a wasteful number, since it uses less digits than its factorization.

21144823838406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174712435475 (or 1174712435472 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 54.

The spelling of 21144823838406 in words is "twenty-one trillion, one hundred forty-four billion, eight hundred twenty-three million, eight hundred thirty-eight thousand, four hundred six".