21828846 has 16 divisors (see below), whose sum is σ = 47016144. Its totient is φ = 6716544.

The previous prime is 21828841. The next prime is 21828847. The reversal of 21828846 is 64882812.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21828841) 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 7 ways as a sum of consecutive naturals, for example, 139851 + ... + 140006.

It is an arithmetic number, because the mean of its divisors is an integer number (2938509).

Almost surely, 2^21828846 is an apocalyptic number.

21828846 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21828846 is an abundant number, since it is smaller than the sum of its proper divisors (25187298).

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

21828846 is a wasteful number, since it uses less digits than its factorization.

21828846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279875.

The product of its digits is 49152, while the sum is 39.

The square root of 21828846 is about 4672.1350579794. The cubic root of 21828846 is about 279.4754038069.

The spelling of 21828846 in words is "twenty-one million, eight hundred twenty-eight thousand, eight hundred forty-six".