21034426 has 24 divisors (see below), whose sum is σ = 37701396. Its totient is φ = 8769600.

The previous prime is 21034421. The next prime is 21034471. The reversal of 21034426 is 62443012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15202201 + 5832225 = 3899^2 + 2415^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21034397 and 21034406.

It is not an unprimeable number, because it can be changed into a prime (21034421) 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 11 ways as a sum of consecutive naturals, for example, 726 + ... + 6526.

Almost surely, 2^21034426 is an apocalyptic number.

21034426 is a deficient number, since it is larger than the sum of its proper divisors (16666970).

21034426 is a wasteful number, since it uses less digits than its factorization.

21034426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5854 (or 5847 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21034426 is about 4586.3303413514. The cubic root of 21034426 is about 276.0430952100.

Adding to 21034426 its reverse (62443012), we get a palindrome (83477438).

The spelling of 21034426 in words is "twenty-one million, thirty-four thousand, four hundred twenty-six".