21852028 has 24 divisors (see below), whose sum is σ = 41945904. Its totient is φ = 9878400.

The previous prime is 21852013. The next prime is 21852029. The reversal of 21852028 is 82025812.

It is a super-2 number, since 2×21852028² = 955022255425568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21851987 and 21852005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852029) 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, 7408 + ... + 9928.

It is an arithmetic number, because the mean of its divisors is an integer number (1747746).

Almost surely, 2^21852028 is an apocalyptic number.

It is an amenable number.

21852028 is a deficient number, since it is larger than the sum of its proper divisors (20093876).

21852028 is a wasteful number, since it uses less digits than its factorization.

21852028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733 (or 2731 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 21852028 is about 4674.6152782876. The cubic root of 21852028 is about 279.5743020979.

The spelling of 21852028 in words is "twenty-one million, eight hundred fifty-two thousand, twenty-eight".