21852943 has 8 divisors (see below), whose sum is σ = 25012512. Its totient is φ = 18702816.

The previous prime is 21852913. The next prime is 21852947. The reversal of 21852943 is 34925812.

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 21852943 - 2⁵ = 21852911 is a prime.

It is a super-2 number, since 2×21852943² = 955102235522498, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 21852899 and 21852908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852947) 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, 3621 + ... + 7537.

It is an arithmetic number, because the mean of its divisors is an integer number (3126564).

Almost surely, 2^21852943 is an apocalyptic number.

21852943 is a deficient number, since it is larger than the sum of its proper divisors (3159569).

21852943 is an equidigital number, since it uses as much as digits as its factorization.

21852943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4721.

The product of its digits is 17280, while the sum is 34.

The square root of 21852943 is about 4674.7131462797. The cubic root of 21852943 is about 279.5782042059.

The spelling of 21852943 in words is "twenty-one million, eight hundred fifty-two thousand, nine hundred forty-three".