21234422 has 8 divisors (see below), whose sum is σ = 34747272. Its totient is φ = 9652000.

The previous prime is 21234401. The next prime is 21234427. The reversal of 21234422 is 22443212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21234394 and 21234403.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 482579 + ... + 482622.

It is an arithmetic number, because the mean of its divisors is an integer number (4343409).

Almost surely, 2^21234422 is an apocalyptic number.

21234422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21234422 is a deficient number, since it is larger than the sum of its proper divisors (13512850).

21234422 is a wasteful number, since it uses less digits than its factorization.

21234422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965214.

The product of its digits is 768, while the sum is 20.

The square root of 21234422 is about 4608.0822475299. The cubic root of 21234422 is about 276.9152125299.

Adding to 21234422 its reverse (22443212), we get a palindrome (43677634).

The spelling of 21234422 in words is "twenty-one million, two hundred thirty-four thousand, four hundred twenty-two".