21342044 has 12 divisors (see below), whose sum is σ = 38358264. Its totient is φ = 10382544.

The previous prime is 21342031. The next prime is 21342047. The reversal of 21342044 is 44024312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342047) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 71954 + ... + 72249.

It is an arithmetic number, because the mean of its divisors is an integer number (3196522).

Almost surely, 2^21342044 is an apocalyptic number.

It is an amenable number.

21342044 is a deficient number, since it is larger than the sum of its proper divisors (17016220).

21342044 is a wasteful number, since it uses less digits than its factorization.

21342044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144244 (or 144242 counting only the distinct ones).

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

The square root of 21342044 is about 4619.7450146085. The cubic root of 21342044 is about 277.3822523472.

Adding to 21342044 its reverse (44024312), we get a palindrome (65366356).

The spelling of 21342044 in words is "twenty-one million, three hundred forty-two thousand, forty-four".