21232125 has 56 divisors (see below), whose sum is σ = 39898872. Its totient is φ = 11275200.

The previous prime is 21232121. The next prime is 21232157. The reversal of 21232125 is 52123212.

It can be written as a sum of positive squares in 4 ways, for example, as 2802276 + 18429849 = 1674^2 + 4293^2 .

It is not a de Polignac number, because 21232125 - 2² = 21232121 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21232098 and 21232107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 91009 + ... + 91241.

Almost surely, 2^21232125 is an apocalyptic number.

21232125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21232125 is a deficient number, since it is larger than the sum of its proper divisors (18666747).

21232125 is an frugal number, since it uses more digits than its factorization.

21232125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 241 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 21232125 is about 4607.8330047865. The cubic root of 21232125 is about 276.9052272149.

Adding to 21232125 its reverse (52123212), we get a palindrome (73355337).

The spelling of 21232125 in words is "twenty-one million, two hundred thirty-two thousand, one hundred twenty-five".