21532203 has 32 divisors (see below), whose sum is σ = 39774720. Its totient is φ = 11184480.

The previous prime is 21532201. The next prime is 21532219. The reversal of 21532203 is 30223512.

It is not a de Polignac number, because 21532203 - 2¹ = 21532201 is a prime.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (21532201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3100 + ... + 7257.

It is an arithmetic number, because the mean of its divisors is an integer number (1242960).

Almost surely, 2^21532203 is an apocalyptic number.

21532203 is a deficient number, since it is larger than the sum of its proper divisors (18242517).

21532203 is a wasteful number, since it uses less digits than its factorization.

21532203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10384 (or 10378 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21532203 is about 4640.2804872120. The cubic root of 21532203 is about 278.2036488932.

Adding to 21532203 its reverse (30223512), we get a palindrome (51755715).

It can be divided in two parts, 2153 and 2203, that added together give a square (4356 = 66²).

The spelling of 21532203 in words is "twenty-one million, five hundred thirty-two thousand, two hundred three".