21822318 has 32 divisors (see below), whose sum is σ = 55422720. Its totient is φ = 6234840.

The previous prime is 21822293. The next prime is 21822343. The reversal of 21822318 is 81322812.

It is an interprime number because it is at equal distance from previous prime (21822293) and next prime (21822343).

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 = 21822291 and 21822300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28488 + ... + 29243.

It is an arithmetic number, because the mean of its divisors is an integer number (1731960).

Almost surely, 2^21822318 is an apocalyptic number.

21822318 is an abundant number, since it is smaller than the sum of its proper divisors (33600402).

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

21822318 is a wasteful number, since it uses less digits than its factorization.

21822318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57749 (or 57743 counting only the distinct ones).

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

The square root of 21822318 is about 4671.4363957995. The cubic root of 21822318 is about 279.4475416327.

It can be divided in two parts, 21822 and 318, that multiplied together give a palindrome (6939396).

The spelling of 21822318 in words is "twenty-one million, eight hundred twenty-two thousand, three hundred eighteen".