21343242 has 8 divisors (see below), whose sum is σ = 42686496. Its totient is φ = 7114412.

The previous prime is 21343187. The next prime is 21343243. The reversal of 21343242 is 24234312.

It is a sphenic number, since it is the product of 3 distinct primes.

21343242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21343243) 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, 1778598 + ... + 1778609.

It is an arithmetic number, because the mean of its divisors is an integer number (5335812).

Almost surely, 2^21343242 is an apocalyptic number.

21343242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21343242 is a wasteful number, since it uses less digits than its factorization.

21343242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557212.

The product of its digits is 1152, while the sum is 21.

The square root of 21343242 is about 4619.8746736248. The cubic root of 21343242 is about 277.3874423799.

Adding to 21343242 its reverse (24234312), we get a palindrome (45577554).

The spelling of 21343242 in words is "twenty-one million, three hundred forty-three thousand, two hundred forty-two".