21202312 has 16 divisors (see below), whose sum is σ = 39847500. Its totient is φ = 10576320.

The previous prime is 21202283. The next prime is 21202367. The reversal of 21202312 is 21320212.

It can be written as a sum of positive squares in 2 ways, for example, as 17690436 + 3511876 = 4206^2 + 1874^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21202292 and 21202301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 814 + ... + 6562.

Almost surely, 2^21202312 is an apocalyptic number.

It is an amenable number.

21202312 is a deficient number, since it is larger than the sum of its proper divisors (18645188).

21202312 is a wasteful number, since it uses less digits than its factorization.

21202312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6216 (or 6212 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21202312 is about 4604.5968336001. The cubic root of 21202312 is about 276.7755613984.

Adding to 21202312 its reverse (21320212), we get a palindrome (42522524).

The spelling of 21202312 in words is "twenty-one million, two hundred two thousand, three hundred twelve".