21323122 has 8 divisors (see below), whose sum is σ = 32314716. Its totient is φ = 10551552.

The previous prime is 21323089. The next prime is 21323129. The reversal of 21323122 is 22132312.

It can be written as a sum of positive squares in 2 ways, for example, as 20985561 + 337561 = 4581^2 + 581^2 .

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 = 21323096 and 21323105.

It is not an unprimeable number, because it can be changed into a prime (21323129) 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 3 ways as a sum of consecutive naturals, for example, 54763 + ... + 55150.

Almost surely, 2^21323122 is an apocalyptic number.

21323122 is a deficient number, since it is larger than the sum of its proper divisors (10991594).

21323122 is a wasteful number, since it uses less digits than its factorization.

21323122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110012.

The product of its digits is 144, while the sum is 16.

The square root of 21323122 is about 4617.6966119484. The cubic root of 21323122 is about 277.3002517837.

Adding to 21323122 its reverse (22132312), we get a palindrome (43455434).

It can be divided in two parts, 2132312 and 2, that multiplied together give a palindrome (4264624).

The spelling of 21323122 in words is "twenty-one million, three hundred twenty-three thousand, one hundred twenty-two".