21826147 has 12 divisors (see below), whose sum is σ = 26500240. Its totient is φ = 17606016.

The previous prime is 21826141. The next prime is 21826151. The reversal of 21826147 is 74162812.

It is not a de Polignac number, because 21826147 - 2⁷ = 21826019 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 (21826141) 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 11 ways as a sum of consecutive naturals, for example, 3372 + ... + 7417.

Almost surely, 2^21826147 is an apocalyptic number.

21826147 is a deficient number, since it is larger than the sum of its proper divisors (4674093).

21826147 is a wasteful number, since it uses less digits than its factorization.

21826147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10830 (or 10813 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 21826147 is about 4671.8462089414. The cubic root of 21826147 is about 279.4638848715.

Adding to 21826147 its reverse (74162812), we get a palindrome (95988959).

The spelling of 21826147 in words is "twenty-one million, eight hundred twenty-six thousand, one hundred forty-seven".