21054325 has 6 divisors (see below), whose sum is σ = 26107394. Its totient is φ = 16843440.

The previous prime is 21054323. The next prime is 21054329. The reversal of 21054325 is 52345012.

It can be written as a sum of positive squares in 3 ways, for example, as 2452356 + 18601969 = 1566^2 + 4313^2 .

It is not a de Polignac number, because 21054325 - 2¹ = 21054323 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21054296 and 21054305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054323) 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, 421062 + ... + 421111.

Almost surely, 2^21054325 is an apocalyptic number.

21054325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21054325 is a deficient number, since it is larger than the sum of its proper divisors (5053069).

21054325 is an equidigital number, since it uses as much as digits as its factorization.

21054325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842183 (or 842178 counting only the distinct ones).

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

The square root of 21054325 is about 4588.4992099814. The cubic root of 21054325 is about 276.1301152584.

Adding to 21054325 its reverse (52345012), we get a palindrome (73399337).

The spelling of 21054325 in words is "twenty-one million, fifty-four thousand, three hundred twenty-five".