21350425 has 6 divisors (see below), whose sum is σ = 26474558. Its totient is φ = 17080320.

The previous prime is 21350401. The next prime is 21350437. The reversal of 21350425 is 52405312.

It can be written as a sum of positive squares in 3 ways, for example, as 6046681 + 15303744 = 2459^2 + 3912^2 .

It is not a de Polignac number, because 21350425 - 2¹¹ = 21348377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21350396 and 21350405.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 426984 + ... + 427033.

Almost surely, 2^21350425 is an apocalyptic number.

21350425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21350425 is a deficient number, since it is larger than the sum of its proper divisors (5124133).

21350425 is an equidigital number, since it uses as much as digits as its factorization.

21350425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854027 (or 854022 counting only the distinct ones).

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

The square root of 21350425 is about 4620.6520102687. The cubic root of 21350425 is about 277.4185568426.

Adding to 21350425 its reverse (52405312), we get a palindrome (73755737).

The spelling of 21350425 in words is "twenty-one million, three hundred fifty thousand, four hundred twenty-five".