21324426 has 16 divisors (see below), whose sum is σ = 45157824. Its totient is φ = 6689984.

The previous prime is 21324421. The next prime is 21324451. The reversal of 21324426 is 62442312.

It is a super-2 number, since 2×21324426² = 909462288458952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21324396 and 21324405.

It is not an unprimeable number, because it can be changed into a prime (21324421) 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, 104430 + ... + 104633.

It is an arithmetic number, because the mean of its divisors is an integer number (2822364).

Almost surely, 2^21324426 is an apocalyptic number.

21324426 is an abundant number, since it is smaller than the sum of its proper divisors (23833398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21324426 is a wasteful number, since it uses less digits than its factorization.

21324426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209085.

The product of its digits is 2304, while the sum is 24.

The square root of 21324426 is about 4617.8378057268. The cubic root of 21324426 is about 277.3059043668.

Adding to 21324426 its reverse (62442312), we get a palindrome (83766738).

The spelling of 21324426 in words is "twenty-one million, three hundred twenty-four thousand, four hundred twenty-six".