21825039 has 8 divisors (see below), whose sum is σ = 29248560. Its totient is φ = 14475776.

The previous prime is 21825031. The next prime is 21825043. The reversal of 21825039 is 93052812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21825039 - 2³ = 21825031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21824997 and 21825015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21825031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17874 + ... + 19055.

It is an arithmetic number, because the mean of its divisors is an integer number (3656070).

Almost surely, 2^21825039 is an apocalyptic number.

21825039 is a deficient number, since it is larger than the sum of its proper divisors (7423521).

21825039 is a wasteful number, since it uses less digits than its factorization.

21825039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37129.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 21825039 is about 4671.7276247658. The cubic root of 21825039 is about 279.4591558153.

The spelling of 21825039 in words is "twenty-one million, eight hundred twenty-five thousand, thirty-nine".