21853032 has 32 divisors (see below), whose sum is σ = 54768480. Its totient is φ = 7266240.

The previous prime is 21853031. The next prime is 21853043. The reversal of 21853032 is 23035812.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21852993 and 21853011.

It is not an unprimeable number, because it can be changed into a prime (21853031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11682 + ... + 13422.

It is an arithmetic number, because the mean of its divisors is an integer number (1711515).

Almost surely, 2^21853032 is an apocalyptic number.

It is an amenable number.

21853032 is an abundant number, since it is smaller than the sum of its proper divisors (32915448).

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

21853032 is a wasteful number, since it uses less digits than its factorization.

21853032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273 (or 2269 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21853032 is about 4674.7226655707. The cubic root of 21853032 is about 279.5785837494.

Adding to 21853032 its reverse (23035812), we get a palindrome (44888844).

The spelling of 21853032 in words is "twenty-one million, eight hundred fifty-three thousand, thirty-two".