21422426 has 16 divisors (see below), whose sum is σ = 33384960. Its totient is φ = 10298640.

The previous prime is 21422419. The next prime is 21422449. The reversal of 21422426 is 62422412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9320 + ... + 11388.

It is an arithmetic number, because the mean of its divisors is an integer number (2086560).

Almost surely, 2^21422426 is an apocalyptic number.

21422426 is a deficient number, since it is larger than the sum of its proper divisors (11962534).

21422426 is a wasteful number, since it uses less digits than its factorization.

21422426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2269.

The product of its digits is 1536, while the sum is 23.

The square root of 21422426 is about 4628.4366691141. The cubic root of 21422426 is about 277.7300573076.

Adding to 21422426 its reverse (62422412), we get a palindrome (83844838).

The spelling of 21422426 in words is "twenty-one million, four hundred twenty-two thousand, four hundred twenty-six".