21852424 has 16 divisors (see below), whose sum is σ = 44698320. Its totient is φ = 9932880.

The previous prime is 21852421. The next prime is 21852431. The reversal of 21852424 is 42425812.

It is a junction number, because it is equal to n+sod(n) for n = 21852392 and 21852401.

It is not an unprimeable number, because it can be changed into a prime (21852421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124074 + ... + 124249.

It is an arithmetic number, because the mean of its divisors is an integer number (2793645).

Almost surely, 2^21852424 is an apocalyptic number.

It is an amenable number.

21852424 is an abundant number, since it is smaller than the sum of its proper divisors (22845896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21852424 is a wasteful number, since it uses less digits than its factorization.

21852424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248340 (or 248336 counting only the distinct ones).

The product of its digits is 5120, while the sum is 28.

The square root of 21852424 is about 4674.6576345226. The cubic root of 21852424 is about 279.5759908924.

The spelling of 21852424 in words is "twenty-one million, eight hundred fifty-two thousand, four hundred twenty-four".