21323342 has 4 divisors (see below), whose sum is σ = 31985016. Its totient is φ = 10661670.

The previous prime is 21323311. The next prime is 21323371. The reversal of 21323342 is 24332312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5330834 + ... + 5330837.

It is an arithmetic number, because the mean of its divisors is an integer number (7996254).

Almost surely, 2^21323342 is an apocalyptic number.

21323342 is a deficient number, since it is larger than the sum of its proper divisors (10661674).

21323342 is a wasteful number, since it uses less digits than its factorization.

21323342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661673.

The product of its digits is 864, while the sum is 20.

The square root of 21323342 is about 4617.7204332874. The cubic root of 21323342 is about 277.3012054565.

Adding to 21323342 its reverse (24332312), we get a palindrome (45655654).

The spelling of 21323342 in words is "twenty-one million, three hundred twenty-three thousand, three hundred forty-two".