21433426 has 16 divisors (see below), whose sum is σ = 36804096. Its totient is φ = 9170496.

The previous prime is 21433421. The next prime is 21433427. The reversal of 21433426 is 62433412.

It is a self number, because there is not a number n which added to its sum of digits gives 21433426.

It is not an unprimeable number, because it can be changed into a prime (21433421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12895 + ... + 14461.

It is an arithmetic number, because the mean of its divisors is an integer number (2300256).

Almost surely, 2^21433426 is an apocalyptic number.

21433426 is a deficient number, since it is larger than the sum of its proper divisors (15370670).

21433426 is a wasteful number, since it uses less digits than its factorization.

21433426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553.

The product of its digits is 3456, while the sum is 25.

The square root of 21433426 is about 4629.6248228123. The cubic root of 21433426 is about 277.7775855051. Note that the first 3 decimals are identical.

Adding to 21433426 its reverse (62433412), we get a palindrome (83866838).

The spelling of 21433426 in words is "twenty-one million, four hundred thirty-three thousand, four hundred twenty-six".