21353202 has 24 divisors (see below), whose sum is σ = 49824684. Its totient is φ = 6570144.

The previous prime is 21353201. The next prime is 21353219. The reversal of 21353202 is 20235312.

It can be written as a sum of positive squares in 2 ways, for example, as 20711601 + 641601 = 4551^2 + 801^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21353201) 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 11 ways as a sum of consecutive naturals, for example, 45393 + ... + 45860.

Almost surely, 2^21353202 is an apocalyptic number.

21353202 is an abundant number, since it is smaller than the sum of its proper divisors (28471482).

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

21353202 is a wasteful number, since it uses less digits than its factorization.

21353202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91274 (or 91271 counting only the distinct ones).

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

The square root of 21353202 is about 4620.9524992149. The cubic root of 21353202 is about 277.4305840494.

Adding to 21353202 its reverse (20235312), we get a palindrome (41588514).

The spelling of 21353202 in words is "twenty-one million, three hundred fifty-three thousand, two hundred two".