21852929 has 8 divisors (see below), whose sum is σ = 25014720. Its totient is φ = 18701136.

The previous prime is 21852913. The next prime is 21852947. The reversal of 21852929 is 92925812.

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 21852929 - 2⁴ = 21852913 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21852892 and 21852901.

It is not an unprimeable number, because it can be changed into a prime (21852949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3002 + ... + 7260.

It is an arithmetic number, because the mean of its divisors is an integer number (3126840).

Almost surely, 2^21852929 is an apocalyptic number.

It is an amenable number.

21852929 is a deficient number, since it is larger than the sum of its proper divisors (3161791).

21852929 is an equidigital number, since it uses as much as digits as its factorization.

21852929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4999.

The product of its digits is 25920, while the sum is 38.

The square root of 21852929 is about 4674.7116488613. The cubic root of 21852929 is about 279.5781445023.

The spelling of 21852929 in words is "twenty-one million, eight hundred fifty-two thousand, nine hundred twenty-nine".