21035125 has 8 divisors (see below), whose sum is σ = 26251992. Its totient is φ = 16828000.

The previous prime is 21035123. The next prime is 21035149. The reversal of 21035125 is 52153012.

It can be written as a sum of positive squares in 4 ways, for example, as 40401 + 20994724 = 201^2 + 4582^2 .

It is not a de Polignac number, because 21035125 - 2¹ = 21035123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035123) 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, 84016 + ... + 84265.

It is an arithmetic number, because the mean of its divisors is an integer number (3281499).

Almost surely, 2^21035125 is an apocalyptic number.

21035125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21035125 is a deficient number, since it is larger than the sum of its proper divisors (5216867).

21035125 is an equidigital number, since it uses as much as digits as its factorization.

21035125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168296 (or 168286 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21035125 is about 4586.4065454340. The cubic root of 21035125 is about 276.0461529274.

Adding to 21035125 its reverse (52153012), we get a palindrome (73188137).

The spelling of 21035125 in words is "twenty-one million, thirty-five thousand, one hundred twenty-five".