21341225 has 12 divisors (see below), whose sum is σ = 26553360. Its totient is φ = 17014800.

The previous prime is 21341191. The next prime is 21341249. The reversal of 21341225 is 52214312.

It is not a de Polignac number, because 21341225 - 2¹⁸ = 21079081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21341197 and 21341206.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6986 + ... + 9564.

It is an arithmetic number, because the mean of its divisors is an integer number (2212780).

Almost surely, 2^21341225 is an apocalyptic number.

21341225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21341225 is a deficient number, since it is larger than the sum of its proper divisors (5212135).

21341225 is a wasteful number, since it uses less digits than its factorization.

21341225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920 (or 2915 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21341225 is about 4619.6563725022. The cubic root of 21341225 is about 277.3787041245.

Adding to 21341225 its reverse (52214312), we get a palindrome (73555537).

The spelling of 21341225 in words is "twenty-one million, three hundred forty-one thousand, two hundred twenty-five".