21911125 has 16 divisors (see below), whose sum is σ = 27817920. Its totient is φ = 17226000.

The previous prime is 21911119. The next prime is 21911137. The reversal of 21911125 is 52111912.

It is not a de Polignac number, because 21911125 - 2⁹ = 21910613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21911096 and 21911105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5890 + ... + 8860.

It is an arithmetic number, because the mean of its divisors is an integer number (1738620).

Almost surely, 2^21911125 is an apocalyptic number.

21911125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21911125 is a deficient number, since it is larger than the sum of its proper divisors (5906795).

21911125 is an equidigital number, since it uses as much as digits as its factorization.

21911125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045 (or 3035 counting only the distinct ones).

The product of its digits is 180, while the sum is 22.

The square root of 21911125 is about 4680.9320653049. The cubic root of 21911125 is about 279.8261037574.

The spelling of 21911125 in words is "twenty-one million, nine hundred eleven thousand, one hundred twenty-five".