21726125 has 16 divisors (see below), whose sum is σ = 27293760. Its totient is φ = 17266000.

The previous prime is 21726121. The next prime is 21726143. The reversal of 21726125 is 52162712.

It is not a de Polignac number, because 21726125 - 2² = 21726121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21726094 and 21726103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726121) by changing a digit.

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, 21890 + ... + 22860.

It is an arithmetic number, because the mean of its divisors is an integer number (1705860).

Almost surely, 2^21726125 is an apocalyptic number.

21726125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21726125 is a deficient number, since it is larger than the sum of its proper divisors (5567635).

21726125 is an equidigital number, since it uses as much as digits as its factorization.

21726125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165 (or 1155 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 21726125 is about 4661.1291550439. The cubic root of 21726125 is about 279.0363343009.

Adding to 21726125 its reverse (52162712), we get a palindrome (73888837).

The spelling of 21726125 in words is "twenty-one million, seven hundred twenty-six thousand, one hundred twenty-five".