21825374 has 8 divisors (see below), whose sum is σ = 32939400. Its totient is φ = 10845576.

The previous prime is 21825361. The next prime is 21825403. The reversal of 21825374 is 47352812.

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

It is a Curzon number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 21825374.

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 3 ways as a sum of consecutive naturals, for example, 33149 + ... + 33800.

It is an arithmetic number, because the mean of its divisors is an integer number (4117425).

Almost surely, 2^21825374 is an apocalyptic number.

21825374 is a deficient number, since it is larger than the sum of its proper divisors (11114026).

21825374 is a wasteful number, since it uses less digits than its factorization.

21825374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67114.

The product of its digits is 13440, while the sum is 32.

The square root of 21825374 is about 4671.7634786021. The cubic root of 21825374 is about 279.4605856461.

The spelling of 21825374 in words is "twenty-one million, eight hundred twenty-five thousand, three hundred seventy-four".