21440122 has 8 divisors (see below), whose sum is σ = 35083872. Its totient is φ = 9745500.

The previous prime is 21440119. The next prime is 21440129. The reversal of 21440122 is 22104412.

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 = 21440096 and 21440105.

It is not an unprimeable number, because it can be changed into a prime (21440129) 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 3 ways as a sum of consecutive naturals, for example, 487254 + ... + 487297.

It is an arithmetic number, because the mean of its divisors is an integer number (4385484).

Almost surely, 2^21440122 is an apocalyptic number.

21440122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21440122 is a deficient number, since it is larger than the sum of its proper divisors (13643750).

21440122 is a wasteful number, since it uses less digits than its factorization.

21440122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974564.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21440122 is about 4630.3479350908. The cubic root of 21440122 is about 277.8065092533.

Adding to 21440122 its reverse (22104412), we get a palindrome (43544534).

The spelling of 21440122 in words is "twenty-one million, four hundred forty thousand, one hundred twenty-two".