21234426 has 16 divisors (see below), whose sum is σ = 42535200. Its totient is φ = 7067088.

The previous prime is 21234401. The next prime is 21234427. The reversal of 21234426 is 62443212.

It is a junction number, because it is equal to n+sod(n) for n = 21234396 and 21234405.

It is not an unprimeable number, because it can be changed into a prime (21234427) 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, 2040 + ... + 6828.

It is an arithmetic number, because the mean of its divisors is an integer number (2658450).

Almost surely, 2^21234426 is an apocalyptic number.

21234426 is an abundant number, since it is smaller than the sum of its proper divisors (21300774).

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

21234426 is a wasteful number, since it uses less digits than its factorization.

21234426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5533.

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

The square root of 21234426 is about 4608.0826815499. The cubic root of 21234426 is about 276.9152299177.

Adding to 21234426 its reverse (62443212), we get a palindrome (83677638).

The spelling of 21234426 in words is "twenty-one million, two hundred thirty-four thousand, four hundred twenty-six".