21342344 has 32 divisors (see below), whose sum is σ = 44219520. Its totient is φ = 9605376.

The previous prime is 21342341. The next prime is 21342359. The reversal of 21342344 is 44324312.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (21342341) 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, 284 + ... + 6539.

It is an arithmetic number, because the mean of its divisors is an integer number (1381860).

Almost surely, 2^21342344 is an apocalyptic number.

It is an amenable number.

21342344 is an abundant number, since it is smaller than the sum of its proper divisors (22877176).

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

21342344 is a wasteful number, since it uses less digits than its factorization.

21342344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6869 (or 6865 counting only the distinct ones).

The product of its digits is 2304, while the sum is 23.

The square root of 21342344 is about 4619.7774838189. Note that the first 3 decimals coincide. The cubic root of 21342344 is about 277.3835520397.

Adding to 21342344 its reverse (44324312), we get a palindrome (65666656).

The spelling of 21342344 in words is "twenty-one million, three hundred forty-two thousand, three hundred forty-four".