21223342 has 32 divisors (see below), whose sum is σ = 39974400. Its totient is φ = 8239968.

The previous prime is 21223333. The next prime is 21223357. The reversal of 21223342 is 24332212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4384 + ... + 7852.

It is an arithmetic number, because the mean of its divisors is an integer number (1249200).

Almost surely, 2^21223342 is an apocalyptic number.

21223342 is a deficient number, since it is larger than the sum of its proper divisors (18751058).

21223342 is a wasteful number, since it uses less digits than its factorization.

21223342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520.

The product of its digits is 576, while the sum is 19.

The square root of 21223342 is about 4606.8798551731. The cubic root of 21223342 is about 276.8670398919.

Adding to 21223342 its reverse (24332212), we get a palindrome (45555554).

The spelling of 21223342 in words is "twenty-one million, two hundred twenty-three thousand, three hundred forty-two".