21220325 has 12 divisors (see below), whose sum is σ = 30072480. Its totient is φ = 14550960.

The previous prime is 21220319. The next prime is 21220327. The reversal of 21220325 is 52302212.

It is not a de Polignac number, because 21220325 - 2⁶ = 21220261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220327) 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, 60455 + ... + 60804.

It is an arithmetic number, because the mean of its divisors is an integer number (2506040).

Almost surely, 2^21220325 is an apocalyptic number.

21220325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21220325 is a deficient number, since it is larger than the sum of its proper divisors (8852155).

21220325 is a wasteful number, since it uses less digits than its factorization.

21220325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121276 (or 121271 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21220325 is about 4606.5523984863. The cubic root of 21220325 is about 276.8539199437.

Adding to 21220325 its reverse (52302212), we get a palindrome (73522537).

The spelling of 21220325 in words is "twenty-one million, two hundred twenty thousand, three hundred twenty-five".