21344449 has 24 divisors (see below), whose sum is σ = 26052648. Its totient is φ = 17418240.

The previous prime is 21344447. The next prime is 21344459. The reversal of 21344449 is 94444312.

It can be written as a sum of positive squares in 4 ways, for example, as 705600 + 20638849 = 840^2 + 4543^2 .

It is not a de Polignac number, because 21344449 - 2¹ = 21344447 is a prime.

It is a super-2 number, since 2×21344449² = 911171006227202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21344449.

It is not an unprimeable number, because it can be changed into a prime (21344447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110497 + ... + 110689.

It is an arithmetic number, because the mean of its divisors is an integer number (1085527).

Almost surely, 2^21344449 is an apocalyptic number.

It is an amenable number.

21344449 is a deficient number, since it is larger than the sum of its proper divisors (4708199).

21344449 is a wasteful number, since it uses less digits than its factorization.

21344449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 298 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 21344449 is about 4620.0053030273. The cubic root of 21344449 is about 277.3926712065.

It can be divided in two parts, 213444 and 49, that multiplied together give a square (10458756 = 3234²).

The spelling of 21344449 in words is "twenty-one million, three hundred forty-four thousand, four hundred forty-nine".