21852004 has 24 divisors (see below), whose sum is σ = 40709088. Its totient is φ = 10227840.

The previous prime is 21851989. The next prime is 21852011. The reversal of 21852004 is 40025812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13587 + ... + 15109.

It is an arithmetic number, because the mean of its divisors is an integer number (1696212).

Almost surely, 2^21852004 is an apocalyptic number.

It is an amenable number.

21852004 is a deficient number, since it is larger than the sum of its proper divisors (18857084).

21852004 is a wasteful number, since it uses less digits than its factorization.

21852004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 21852004 is about 4674.6127112307. The cubic root of 21852004 is about 279.5741997461.

Adding to 21852004 its reverse (40025812), we get a palindrome (61877816).

The spelling of 21852004 in words is "twenty-one million, eight hundred fifty-two thousand, four".