21864942799271 has 48 divisors (see below), whose sum is σ = 26166710497248. Its totient is φ = 18109181376000.

The previous prime is 21864942799243. The next prime is 21864942799279. The reversal of 21864942799271 is 17299724946812.

It is a happy number.

It is not a de Polignac number, because 21864942799271 - 2³⁴ = 21847762930087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21864942799195 and 21864942799204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21864942799279) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59335925 + ... + 59703281.

It is an arithmetic number, because the mean of its divisors is an integer number (545139802026).

Almost surely, 2^{21864942799271} is an apocalyptic number.

21864942799271 is a deficient number, since it is larger than the sum of its proper divisors (4301767697977).

21864942799271 is a wasteful number, since it uses less digits than its factorization.

21864942799271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367812 (or 367799 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 71.

The spelling of 21864942799271 in words is "twenty-one trillion, eight hundred sixty-four billion, nine hundred forty-two million, seven hundred ninety-nine thousand, two hundred seventy-one".