21826146 has 8 divisors (see below), whose sum is σ = 43652304. Its totient is φ = 7275380.

The previous prime is 21826141. The next prime is 21826151. The reversal of 21826146 is 64162812.

It is an interprime number because it is at equal distance from previous prime (21826141) and next prime (21826151).

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

21826146 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21826141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1818840 + ... + 1818851.

It is an arithmetic number, because the mean of its divisors is an integer number (5456538).

Almost surely, 2^21826146 is an apocalyptic number.

21826146 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21826146 is a wasteful number, since it uses less digits than its factorization.

21826146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3637696.

The product of its digits is 4608, while the sum is 30.

The square root of 21826146 is about 4671.8461019173. The cubic root of 21826146 is about 279.4638806034.

Adding to 21826146 its reverse (64162812), we get a palindrome (85988958).

The spelling of 21826146 in words is "twenty-one million, eight hundred twenty-six thousand, one hundred forty-six".