21825967 has 12 divisors (see below), whose sum is σ = 22793400. Its totient is φ = 20896416.

The previous prime is 21825959. The next prime is 21825971. The reversal of 21825967 is 76952812.

It is not a de Polignac number, because 21825967 - 2³ = 21825959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21825997) 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 11 ways as a sum of consecutive naturals, for example, 146409 + ... + 146557.

It is an arithmetic number, because the mean of its divisors is an integer number (1899450).

Almost surely, 2^21825967 is an apocalyptic number.

21825967 is a deficient number, since it is larger than the sum of its proper divisors (967433).

21825967 is a wasteful number, since it uses less digits than its factorization.

21825967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 293 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 21825967 is about 4671.8269445689. The cubic root of 21825967 is about 279.4631166241.

The spelling of 21825967 in words is "twenty-one million, eight hundred twenty-five thousand, nine hundred sixty-seven".