21846213 has 16 divisors (see below), whose sum is σ = 32603200. Its totient is φ = 14456880.

The previous prime is 21846179. The next prime is 21846239. The reversal of 21846213 is 31264812.

It is not a de Polignac number, because 21846213 - 2⁹ = 21845701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21846283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843 + ... + 6663.

It is an arithmetic number, because the mean of its divisors is an integer number (2037700).

Almost surely, 2^21846213 is an apocalyptic number.

It is an amenable number.

21846213 is a deficient number, since it is larger than the sum of its proper divisors (10756987).

21846213 is a wasteful number, since it uses less digits than its factorization.

21846213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5969 (or 5963 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21846213 is about 4673.9932605856. The cubic root of 21846213 is about 279.5495009095.

The spelling of 21846213 in words is "twenty-one million, eight hundred forty-six thousand, two hundred thirteen".