21136052 has 18 divisors (see below), whose sum is σ = 43027362. Its totient is φ = 9058224.

The previous prime is 21136039. The next prime is 21136067. The reversal of 21136052 is 25063112.

It can be written as a sum of positive squares in only one way, i.e., 14714896 + 6421156 = 3836^2 + 2534^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53723 + ... + 54114.

It is an arithmetic number, because the mean of its divisors is an integer number (2390409).

Almost surely, 2^21136052 is an apocalyptic number.

It is an amenable number.

21136052 is an abundant number, since it is smaller than the sum of its proper divisors (21891310).

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

21136052 is a wasteful number, since it uses less digits than its factorization.

21136052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107855 (or 107846 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21136052 is about 4597.3962196008. The cubic root of 21136052 is about 276.4869405785.

Adding to 21136052 its reverse (25063112), we get a palindrome (46199164).

It can be divided in two parts, 211 and 36052, that added together give a palindrome (36263).

The spelling of 21136052 in words is "twenty-one million, one hundred thirty-six thousand, fifty-two".