21483225 has 45 divisors (see below), whose sum is σ = 40184463. Its totient is φ = 11346480.

The previous prime is 21483211. The next prime is 21483233. The reversal of 21483225 is 52238412.

The square root of 21483225 is 4635.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7733961 + 13749264 = 2781^2 + 3708^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 21483225 - 2¹¹ = 21481177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 208524 + ... + 208626.

Almost surely, 2^21483225 is an apocalyptic number.

21483225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21483225 is the 4635-th square number.

21483225 is the 2318-th centered octagonal number.

It is an amenable number.

21483225 is a deficient number, since it is larger than the sum of its proper divisors (18701238).

21483225 is an equidigital number, since it uses as much as digits as its factorization.

21483225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 111 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The cubic root of 21483225 is about 277.9925510831.

The spelling of 21483225 in words is "twenty-one million, four hundred eighty-three thousand, two hundred twenty-five".