21035541 has 8 divisors (see below), whose sum is σ = 28576800. Its totient is φ = 13758992.

The previous prime is 21035537. The next prime is 21035549. The reversal of 21035541 is 14553012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21035541 - 2² = 21035537 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035549) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 65991 + ... + 66308.

It is an arithmetic number, because the mean of its divisors is an integer number (3572100).

Almost surely, 2^21035541 is an apocalyptic number.

It is an amenable number.

21035541 is a deficient number, since it is larger than the sum of its proper divisors (7541259).

21035541 is a wasteful number, since it uses less digits than its factorization.

21035541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132355.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21035541 is about 4586.4518966190. The cubic root of 21035541 is about 276.0479726526.

Adding to 21035541 its reverse (14553012), we get a palindrome (35588553).

The spelling of 21035541 in words is "twenty-one million, thirty-five thousand, five hundred forty-one".