21052700 has 18 divisors (see below), whose sum is σ = 45684576. Its totient is φ = 8421040.

The previous prime is 21052687. The next prime is 21052709. The reversal of 21052700 is 725012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052709) 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 in 5 ways as a sum of consecutive naturals, for example, 105164 + ... + 105363.

It is an arithmetic number, because the mean of its divisors is an integer number (2538032).

Almost surely, 2^21052700 is an apocalyptic number.

21052700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21052700 is an abundant number, since it is smaller than the sum of its proper divisors (24631876).

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

21052700 is a wasteful number, since it uses less digits than its factorization.

21052700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210541 (or 210534 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 21052700 is about 4588.3221334165. The cubic root of 21052700 is about 276.1230110493.

Adding to 21052700 its reverse (725012), we get a palindrome (21777712).

The spelling of 21052700 in words is "twenty-one million, fifty-two thousand, seven hundred".