22821318 has 128 divisors (see below), whose sum is σ = 60480000. Its totient is φ = 6314112.

The previous prime is 22821269. The next prime is 22821353. The reversal of 22821318 is 81312822.

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

It is a junction number, because it is equal to n+sod(n) for n = 22821291 and 22821300.

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 63 ways as a sum of consecutive naturals, for example, 386773 + ... + 386831.

It is an arithmetic number, because the mean of its divisors is an integer number (472500).

Almost surely, 2^22821318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22821318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30240000).

22821318 is an abundant number, since it is smaller than the sum of its proper divisors (37658682).

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

22821318 is a wasteful number, since it uses less digits than its factorization.

22821318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 125 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 22821318 is about 4777.1663148775. The cubic root of 22821318 is about 283.6483364701.

It can be divided in two parts, 2282 and 1318, that added together give a square (3600 = 60²).

The spelling of 22821318 in words is "twenty-two million, eight hundred twenty-one thousand, three hundred eighteen".