21339441 has 12 divisors (see below), whose sum is σ = 31171140. Its totient is φ = 14065920.

The previous prime is 21339407. The next prime is 21339463. The reversal of 21339441 is 14493312.

21339441 is a `hidden beast` number, since 213 + 3 + 9 + 441 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2547216 + 18792225 = 1596^2 + 4335^2 .

It is not a de Polignac number, because 21339441 - 2⁷ = 21339313 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21339841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12520 + ... + 14121.

It is an arithmetic number, because the mean of its divisors is an integer number (2597595).

Almost surely, 2^21339441 is an apocalyptic number.

It is an amenable number.

21339441 is a deficient number, since it is larger than the sum of its proper divisors (9831699).

21339441 is a wasteful number, since it uses less digits than its factorization.

21339441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26736 (or 26733 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21339441 is about 4619.4632805121. The cubic root of 21339441 is about 277.3709748369.

The spelling of 21339441 in words is "twenty-one million, three hundred thirty-nine thousand, four hundred forty-one".