21607325 has 12 divisors (see below), whose sum is σ = 26867328. Its totient is φ = 17238000.

The previous prime is 21607321. The next prime is 21607361. The reversal of 21607325 is 52370612.

It is not a de Polignac number, because 21607325 - 2² = 21607321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21607294 and 21607303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21607321) 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, 10100 + ... + 12050.

It is an arithmetic number, because the mean of its divisors is an integer number (2238944).

Almost surely, 2^21607325 is an apocalyptic number.

21607325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21607325 is a deficient number, since it is larger than the sum of its proper divisors (5260003).

21607325 is a wasteful number, since it uses less digits than its factorization.

21607325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404 (or 2399 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21607325 is about 4648.3679931778. The cubic root of 21607325 is about 278.5268076053.

Adding to 21607325 its reverse (52370612), we get a palindrome (73977937).

The spelling of 21607325 in words is "twenty-one million, six hundred seven thousand, three hundred twenty-five".