21130852 has 6 divisors (see below), whose sum is σ = 36978998. Its totient is φ = 10565424.

The previous prime is 21130843. The next prime is 21130853. The reversal of 21130852 is 25803112.

It can be written as a sum of positive squares in only one way, i.e., 14699556 + 6431296 = 3834^2 + 2536^2 .

It is not an unprimeable number, because it can be changed into a prime (21130853) 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 as a sum of consecutive naturals, namely, 2641353 + ... + 2641360.

Almost surely, 2^21130852 is an apocalyptic number.

It is an amenable number.

21130852 is a deficient number, since it is larger than the sum of its proper divisors (15848146).

21130852 is a wasteful number, since it uses less digits than its factorization.

21130852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5282717 (or 5282715 counting only the distinct ones).

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

The square root of 21130852 is about 4596.8306473047. The cubic root of 21130852 is about 276.4642644734.

Adding to 21130852 its reverse (25803112), we get a palindrome (46933964).

The spelling of 21130852 in words is "twenty-one million, one hundred thirty thousand, eight hundred fifty-two".