21868904036839 has 8 divisors (see below), whose sum is σ = 21888643479840. Its totient is φ = 21849172163616.

The previous prime is 21868904036831. The next prime is 21868904036849. The reversal of 21868904036839 is 93863040986812.

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 21868904036839 - 2³ = 21868904036831 is a prime.

It is a super-2 number, since 2×21868904036839² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868904036831) 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 7 ways as a sum of consecutive naturals, for example, 3896097 + ... + 7675765.

It is an arithmetic number, because the mean of its divisors is an integer number (2736080434980).

Almost surely, 2^{21868904036839} is an apocalyptic number.

21868904036839 is a deficient number, since it is larger than the sum of its proper divisors (19739443001).

21868904036839 is a wasteful number, since it uses less digits than its factorization.

21868904036839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3784889.

The product of its (nonzero) digits is 107495424, while the sum is 67.

The spelling of 21868904036839 in words is "twenty-one trillion, eight hundred sixty-eight billion, nine hundred four million, thirty-six thousand, eight hundred thirty-nine".