21349344 has 24 divisors (see below), whose sum is σ = 56042280. Its totient is φ = 7116416.

The previous prime is 21349337. The next prime is 21349357. The reversal of 21349344 is 44394312.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111099 + ... + 111290.

It is an arithmetic number, because the mean of its divisors is an integer number (2335095).

Almost surely, 2^21349344 is an apocalyptic number.

21349344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21349344 is an abundant number, since it is smaller than the sum of its proper divisors (34692936).

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

21349344 is a wasteful number, since it uses less digits than its factorization.

21349344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222402 (or 222394 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 21349344 is about 4620.5350339544. The cubic root of 21349344 is about 277.4138747419.

The spelling of 21349344 in words is "twenty-one million, three hundred forty-nine thousand, three hundred forty-four".