21342242 has 16 divisors (see below), whose sum is σ = 34113312. Its totient is φ = 9979200.

The previous prime is 21342241. The next prime is 21342257. The reversal of 21342242 is 24224312.

It is not an unprimeable number, because it can be changed into a prime (21342241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3617 + ... + 7467.

It is an arithmetic number, because the mean of its divisors is an integer number (2132082).

Almost surely, 2^21342242 is an apocalyptic number.

21342242 is a deficient number, since it is larger than the sum of its proper divisors (12771070).

21342242 is a wasteful number, since it uses less digits than its factorization.

21342242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033.

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

The square root of 21342242 is about 4619.7664443130. The cubic root of 21342242 is about 277.3831101456.

Adding to 21342242 its reverse (24224312), we get a palindrome (45566554).

The spelling of 21342242 in words is "twenty-one million, three hundred forty-two thousand, two hundred forty-two".