21846128821 has 8 divisors (see below), whose sum is σ = 23855223744. Its totient is φ = 19840881120.

The previous prime is 21846128819. The next prime is 21846128833. The reversal of 21846128821 is 12882164812.

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 21846128821 - 2¹ = 21846128819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21846128021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 949921 + ... + 972646.

It is an arithmetic number, because the mean of its divisors is an integer number (2981902968).

Almost surely, 2^21846128821 is an apocalyptic number.

It is an amenable number.

21846128821 is a deficient number, since it is larger than the sum of its proper divisors (2009094923).

21846128821 is a wasteful number, since it uses less digits than its factorization.

21846128821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923611.

The product of its digits is 98304, while the sum is 43.

The spelling of 21846128821 in words is "twenty-one billion, eight hundred forty-six million, one hundred twenty-eight thousand, eight hundred twenty-one".