21035425 has 12 divisors (see below), whose sum is σ = 26790076. Its totient is φ = 16372800.

The previous prime is 21035401. The next prime is 21035429. The reversal of 21035425 is 52453012.

It can be written as a sum of positive squares in 6 ways, for example, as 541696 + 20493729 = 736^2 + 4527^2 .

It is not a de Polignac number, because 21035425 - 2⁵ = 21035393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21035396 and 21035405.

It is not an unprimeable number, because it can be changed into a prime (21035429) 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 11 ways as a sum of consecutive naturals, for example, 10446 + ... + 12295.

Almost surely, 2^21035425 is an apocalyptic number.

21035425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21035425 is a deficient number, since it is larger than the sum of its proper divisors (5754651).

21035425 is a wasteful number, since it uses less digits than its factorization.

21035425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22788 (or 22783 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21035425 is about 4586.4392506606. The cubic root of 21035425 is about 276.0474652316.

Adding to 21035425 its reverse (52453012), we get a palindrome (73488437).

The spelling of 21035425 in words is "twenty-one million, thirty-five thousand, four hundred twenty-five".