21283125 has 20 divisors (see below), whose sum is σ = 35463648. Its totient is φ = 11350000.

The previous prime is 21283117. The next prime is 21283127. The reversal of 21283125 is 52138212.

It is not a de Polignac number, because 21283125 - 2³ = 21283117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21283095 and 21283104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21283127) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3801 + ... + 7550.

Almost surely, 2^21283125 is an apocalyptic number.

21283125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21283125 is a deficient number, since it is larger than the sum of its proper divisors (14180523).

21283125 is an equidigital number, since it uses as much as digits as its factorization.

21283125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11374 (or 11359 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 21283125 is about 4613.3637402659. The cubic root of 21283125 is about 277.1267606131.

It can be divided in two parts, 2128 and 3125, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 21283125 in words is "twenty-one million, two hundred eighty-three thousand, one hundred twenty-five".