21335025 has 12 divisors (see below), whose sum is σ = 35274032. Its totient is φ = 11378640.

The previous prime is 21335023. The next prime is 21335029. The reversal of 21335025 is 52053312.

It is not a de Polignac number, because 21335025 - 2¹ = 21335023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21334992 and 21335010.

It is not an unprimeable number, because it can be changed into a prime (21335023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142159 + ... + 142308.

Almost surely, 2^21335025 is an apocalyptic number.

21335025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21335025 is a deficient number, since it is larger than the sum of its proper divisors (13939007).

21335025 is a wasteful number, since it uses less digits than its factorization.

21335025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284480 (or 284475 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 21335025 is about 4618.9852781753. The cubic root of 21335025 is about 277.3518403975.

Adding to 21335025 its reverse (52053312), we get a palindrome (73388337).

The spelling of 21335025 in words is "twenty-one million, three hundred thirty-five thousand, twenty-five".