21852652821 has 8 divisors (see below), whose sum is σ = 29208111360. Its totient is φ = 14532814752.

The previous prime is 21852652817. The next prime is 21852652879. The reversal of 21852652821 is 12825625812.

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

It is not a de Polignac number, because 21852652821 - 2² = 21852652817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852652121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8903685 + ... + 8906138.

It is an arithmetic number, because the mean of its divisors is an integer number (3651013920).

Almost surely, 2^21852652821 is an apocalyptic number.

It is an amenable number.

21852652821 is a deficient number, since it is larger than the sum of its proper divisors (7355458539).

21852652821 is a wasteful number, since it uses less digits than its factorization.

21852652821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17810235.

The product of its digits is 153600, while the sum is 42.

The spelling of 21852652821 in words is "twenty-one billion, eight hundred fifty-two million, six hundred fifty-two thousand, eight hundred twenty-one".