21858729983999 has 8 divisors (see below), whose sum is σ = 22025776964400. Its totient is φ = 21691685828800.

The previous prime is 21858729983971. The next prime is 21858729984031. The reversal of 21858729983999 is 99938992785812.

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

It is a cyclic number.

It is not a de Polignac number, because 21858729983999 - 2¹² = 21858729979903 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 (21858729983929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16404677 + ... + 17687025.

It is an arithmetic number, because the mean of its divisors is an integer number (2753222120550).

Almost surely, 2^{21858729983999} is an apocalyptic number.

21858729983999 is a deficient number, since it is larger than the sum of its proper divisors (167046980401).

21858729983999 is a wasteful number, since it uses less digits than its factorization.

21858729983999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412601.

The product of its digits is 12697896960, while the sum is 89.

The spelling of 21858729983999 in words is "twenty-one trillion, eight hundred fifty-eight billion, seven hundred twenty-nine million, nine hundred eighty-three thousand, nine hundred ninety-nine".