21036852 has 18 divisors (see below), whose sum is σ = 53176578. Its totient is φ = 7012272.

The previous prime is 21036833. The next prime is 21036877. The reversal of 21036852 is 25863012.

It can be written as a sum of positive squares in only one way, i.e., 18714276 + 2322576 = 4326^2 + 1524^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 292143 + ... + 292214.

Almost surely, 2^21036852 is an apocalyptic number.

It is an amenable number.

21036852 is an abundant number, since it is smaller than the sum of its proper divisors (32139726).

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

21036852 is a wasteful number, since it uses less digits than its factorization.

21036852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584367 (or 584362 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21036852 is about 4586.5948153287. The cubic root of 21036852 is about 276.0537072547.

Adding to 21036852 its reverse (25863012), we get a palindrome (46899864).

The spelling of 21036852 in words is "twenty-one million, thirty-six thousand, eight hundred fifty-two".