21301325 has 12 divisors (see below), whose sum is σ = 26659380. Its totient is φ = 16882560.

The previous prime is 21301321. The next prime is 21301331. The reversal of 21301325 is 52310312.

It can be written as a sum of positive squares in 6 ways, for example, as 3374569 + 17926756 = 1837^2 + 4234^2 .

It is not a de Polignac number, because 21301325 - 2² = 21301321 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1184 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (2221615).

Almost surely, 2^21301325 is an apocalyptic number.

21301325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21301325 is a deficient number, since it is larger than the sum of its proper divisors (5358055).

21301325 is a wasteful number, since it uses less digits than its factorization.

21301325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7936 (or 7931 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21301325 is about 4615.3358491013. The cubic root of 21301325 is about 277.2057319427.

Adding to 21301325 its reverse (52310312), we get a palindrome (73611637).

The spelling of 21301325 in words is "twenty-one million, three hundred one thousand, three hundred twenty-five".