21319125 has 32 divisors (see below), whose sum is σ = 35817600. Its totient is φ = 11260800.

The previous prime is 21319097. The next prime is 21319127. The reversal of 21319125 is 52191312.

It is not a de Polignac number, because 21319125 - 2⁵ = 21319093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21319095 and 21319104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21319127) 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 31 ways as a sum of consecutive naturals, for example, 51921 + ... + 52329.

It is an arithmetic number, because the mean of its divisors is an integer number (1119300).

Almost surely, 2^21319125 is an apocalyptic number.

21319125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21319125 is a deficient number, since it is larger than the sum of its proper divisors (14498475).

21319125 is a wasteful number, since it uses less digits than its factorization.

21319125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 556 counting only the distinct ones).

The product of its digits is 540, while the sum is 24.

The square root of 21319125 is about 4617.2638001310. The cubic root of 21319125 is about 277.2829241402.

The spelling of 21319125 in words is "twenty-one million, three hundred nineteen thousand, one hundred twenty-five".