21041500 has 24 divisors (see below), whose sum is σ = 45955728. Its totient is φ = 8416400.

The previous prime is 21041479. The next prime is 21041513. The reversal of 21041500 is 514012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20542 + ... + 21541.

It is an arithmetic number, because the mean of its divisors is an integer number (1914822).

Almost surely, 2^21041500 is an apocalyptic number.

21041500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21041500 is an abundant number, since it is smaller than the sum of its proper divisors (24914228).

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

21041500 is a wasteful number, since it uses less digits than its factorization.

21041500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42102 (or 42090 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 21041500 is about 4587.1014813278. The cubic root of 21041500 is about 276.0740367087.

Adding to 21041500 its reverse (514012), we get a palindrome (21555512).

The spelling of 21041500 in words is "twenty-one million, forty-one thousand, five hundred".