21144823838408 has 16 divisors (see below), whose sum is σ = 39722350717680. Its totient is φ = 10552196980368.

The previous prime is 21144823838407. The next prime is 21144823838417. The reversal of 21144823838408 is 80483832844112.

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 3 ways as a sum of consecutive naturals, for example, 2526862910 + ... + 2526871277.

It is an arithmetic number, because the mean of its divisors is an integer number (2482646919855).

Almost surely, 2^{21144823838408} is an apocalyptic number.

It is an amenable number.

21144823838408 is a deficient number, since it is larger than the sum of its proper divisors (18577526879272).

21144823838408 is a wasteful number, since it uses less digits than its factorization.

21144823838408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053734716 (or 5053734712 counting only the distinct ones).

The product of its (nonzero) digits is 9437184, while the sum is 56.

The spelling of 21144823838408 in words is "twenty-one trillion, one hundred forty-four billion, eight hundred twenty-three million, eight hundred thirty-eight thousand, four hundred eight".