21335125 has 32 divisors (see below), whose sum is σ = 31299840. Its totient is φ = 14212800.

The previous prime is 21335123. The next prime is 21335137. The reversal of 21335125 is 52153312.

It is not a de Polignac number, because 21335125 - 2¹ = 21335123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21335096 and 21335105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335123) 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 31 ways as a sum of consecutive naturals, for example, 32046 + ... + 32704.

It is an arithmetic number, because the mean of its divisors is an integer number (978120).

Almost surely, 2^21335125 is an apocalyptic number.

21335125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21335125 is a deficient number, since it is larger than the sum of its proper divisors (9964715).

21335125 is an equidigital number, since it uses as much as digits as its factorization.

21335125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718 (or 708 counting only the distinct ones).

The product of its digits is 900, while the sum is 22.

The square root of 21335125 is about 4618.9961030510. The cubic root of 21335125 is about 277.3522737247.

Adding to 21335125 its reverse (52153312), we get a palindrome (73488437).

The spelling of 21335125 in words is "twenty-one million, three hundred thirty-five thousand, one hundred twenty-five".