21138852 has 24 divisors (see below), whose sum is σ = 56370496. Its totient is φ = 6039648.

The previous prime is 21138851. The next prime is 21138853. The reversal of 21138852 is 25883112.

21138852 is nontrivially palindromic in base 5.

It is an interprime number because it is at equal distance from previous prime (21138851) and next prime (21138853).

It is not an unprimeable number, because it can be changed into a prime (21138851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125743 + ... + 125910.

Almost surely, 2^21138852 is an apocalyptic number.

It is an amenable number.

21138852 is an abundant number, since it is smaller than the sum of its proper divisors (35231644).

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

21138852 is a wasteful number, since it uses less digits than its factorization.

21138852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251667 (or 251665 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 21138852 is about 4597.7007297126. The cubic root of 21138852 is about 276.4991492485.

The spelling of 21138852 in words is "twenty-one million, one hundred thirty-eight thousand, eight hundred fifty-two".