21442426 has 32 divisors (see below), whose sum is σ = 34836480. Its totient is φ = 9878400.

The previous prime is 21442411. The next prime is 21442427. The reversal of 21442426 is 62424412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21442426.

It is not an unprimeable number, because it can be changed into a prime (21442427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168775 + ... + 168901.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^21442426 is an apocalyptic number.

21442426 is a deficient number, since it is larger than the sum of its proper divisors (13394054).

21442426 is a wasteful number, since it uses less digits than its factorization.

21442426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270.

The product of its digits is 3072, while the sum is 25.

The square root of 21442426 is about 4630.5967218059. The cubic root of 21442426 is about 277.8164601182.

Adding to 21442426 its reverse (62424412), we get a palindrome (83866838).

The spelling of 21442426 in words is "twenty-one million, four hundred forty-two thousand, four hundred twenty-six".