21853152 has 60 divisors (see below), whose sum is σ = 64277136. Its totient is φ = 7283520.

The previous prime is 21853147. The next prime is 21853213. The reversal of 21853152 is 25135812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 1624 + ... + 6807.

Almost surely, 2^21853152 is an apocalyptic number.

It is an amenable number.

21853152 is an abundant number, since it is smaller than the sum of its proper divisors (42423984).

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

21853152 is an equidigital number, since it uses as much as digits as its factorization.

21853152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8453 (or 8436 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 21853152 is about 4674.7355005390. The cubic root of 21853152 is about 279.5790954917.

Adding to 21853152 its reverse (25135812), we get a palindrome (46988964).

The spelling of 21853152 in words is "twenty-one million, eight hundred fifty-three thousand, one hundred fifty-two".