21088848399 has 8 divisors (see below), whose sum is σ = 28119239040. Its totient is φ = 14058845016.

The previous prime is 21088848397. The next prime is 21088848409. The reversal of 21088848399 is 99384888012.

It is a Cunningham number, because it is equal to 145220²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21088848399 - 2¹ = 21088848397 is a prime.

It is a super-3 number, since 3×21088848399³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21088848397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72612 + ... + 217830.

It is an arithmetic number, because the mean of its divisors is an integer number (3514904880).

Almost surely, 2^21088848399 is an apocalyptic number.

21088848399 is a deficient number, since it is larger than the sum of its proper divisors (7030390641).

21088848399 is a wasteful number, since it uses less digits than its factorization.

21088848399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193629.

The product of its (nonzero) digits is 7962624, while the sum is 60.

The spelling of 21088848399 in words is "twenty-one billion, eighty-eight million, eight hundred forty-eight thousand, three hundred ninety-nine".