21803152 has 20 divisors (see below), whose sum is σ = 48278656. Its totient is φ = 9344160.

The previous prime is 21803141. The next prime is 21803153. The reversal of 21803152 is 25130812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21803153) 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, 97224 + ... + 97447.

Almost surely, 2^21803152 is an apocalyptic number.

It is an amenable number.

21803152 is an abundant number, since it is smaller than the sum of its proper divisors (26475504).

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

21803152 is a wasteful number, since it uses less digits than its factorization.

21803152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194686 (or 194680 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 21803152 is about 4669.3845418856. The cubic root of 21803152 is about 279.3657070581.

Adding to 21803152 its reverse (25130812), we get a palindrome (46933964).

The spelling of 21803152 in words is "twenty-one million, eight hundred three thousand, one hundred fifty-two".