21060425 has 6 divisors (see below), whose sum is σ = 26114958. Its totient is φ = 16848320.

The previous prime is 21060421. The next prime is 21060449. The reversal of 21060425 is 52406012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3579664 + 17480761 = 1892^2 + 4181^2 .

It is not a de Polignac number, because 21060425 - 2² = 21060421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21060397 and 21060406.

It is not an unprimeable number, because it can be changed into a prime (21060421) 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 5 ways as a sum of consecutive naturals, for example, 421184 + ... + 421233.

It is an arithmetic number, because the mean of its divisors is an integer number (4352493).

Almost surely, 2^21060425 is an apocalyptic number.

21060425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21060425 is a deficient number, since it is larger than the sum of its proper divisors (5054533).

21060425 is an equidigital number, since it uses as much as digits as its factorization.

21060425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842427 (or 842422 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21060425 is about 4589.1638671985. The cubic root of 21060425 is about 276.1567801053.

Adding to 21060425 its reverse (52406012), we get a palindrome (73466437).

The spelling of 21060425 in words is "twenty-one million, sixty thousand, four hundred twenty-five".