21243022 has 8 divisors (see below), whose sum is σ = 32963400. Its totient is φ = 10255224.

The previous prime is 21243011. The next prime is 21243023. The reversal of 21243022 is 22034212.

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 = 21242987 and 21243005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243023) 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, 183072 + ... + 183187.

It is an arithmetic number, because the mean of its divisors is an integer number (4120425).

Almost surely, 2^21243022 is an apocalyptic number.

21243022 is a deficient number, since it is larger than the sum of its proper divisors (11720378).

21243022 is a wasteful number, since it uses less digits than its factorization.

21243022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366290.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21243022 is about 4609.0152961343. The cubic root of 21243022 is about 276.9525912947.

Adding to 21243022 its reverse (22034212), we get a palindrome (43277234).

It can be divided in two parts, 212 and 43022, that added together give a palindrome (43234).

The spelling of 21243022 in words is "twenty-one million, two hundred forty-three thousand, twenty-two".