21442322 has 8 divisors (see below), whose sum is σ = 35087472. Its totient is φ = 9746500.

The previous prime is 21442319. The next prime is 21442327. The reversal of 21442322 is 22324412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21442294 and 21442303.

It is not an unprimeable number, because it can be changed into a prime (21442327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487304 + ... + 487347.

It is an arithmetic number, because the mean of its divisors is an integer number (4385934).

Almost surely, 2^21442322 is an apocalyptic number.

21442322 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21442322 is a deficient number, since it is larger than the sum of its proper divisors (13645150).

21442322 is a wasteful number, since it uses less digits than its factorization.

21442322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974664.

The product of its digits is 768, while the sum is 20.

The square root of 21442322 is about 4630.5854921381. The cubic root of 21442322 is about 277.8160109625.

Adding to 21442322 its reverse (22324412), we get a palindrome (43766734).

The spelling of 21442322 in words is "twenty-one million, four hundred forty-two thousand, three hundred twenty-two".