21354041 has 4 divisors (see below), whose sum is σ = 21490212. Its totient is φ = 21217872.

The previous prime is 21354019. The next prime is 21354049. The reversal of 21354041 is 14045312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6175225 + 15178816 = 2485^2 + 3896^2 .

It is a cyclic number.

It is not a de Polignac number, because 21354041 - 2⁶ = 21353977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21354049) 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, 67850 + ... + 68163.

It is an arithmetic number, because the mean of its divisors is an integer number (5372553).

Almost surely, 2^21354041 is an apocalyptic number.

It is an amenable number.

21354041 is a deficient number, since it is larger than the sum of its proper divisors (136171).

21354041 is a wasteful number, since it uses less digits than its factorization.

21354041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136170.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21354041 is about 4621.0432804725. The cubic root of 21354041 is about 277.4342175593.

Adding to 21354041 its reverse (14045312), we get a palindrome (35399353).

The spelling of 21354041 in words is "twenty-one million, three hundred fifty-four thousand, forty-one".