21110425 has 36 divisors (see below), whose sum is σ = 32088720. Its totient is φ = 13698720.

The previous prime is 21110423. The next prime is 21110429. The reversal of 21110425 is 52401112.

It is not a de Polignac number, because 21110425 - 2¹ = 21110423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110399 and 21110408.

It is not an unprimeable number, because it can be changed into a prime (21110423) 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 35 ways as a sum of consecutive naturals, for example, 22822 + ... + 23728.

Almost surely, 2^21110425 is an apocalyptic number.

21110425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21110425 is a deficient number, since it is larger than the sum of its proper divisors (10978295).

21110425 is a wasteful number, since it uses less digits than its factorization.

21110425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950 (or 938 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21110425 is about 4594.6082531593. The cubic root of 21110425 is about 276.3751505993.

Adding to 21110425 its reverse (52401112), we get a palindrome (73511537).

The spelling of 21110425 in words is "twenty-one million, one hundred ten thousand, four hundred twenty-five".