21034541 has 16 divisors (see below), whose sum is σ = 23924160. Its totient is φ = 18318720.

The previous prime is 21034513. The next prime is 21034543. The reversal of 21034541 is 14543012.

It is not a de Polignac number, because 21034541 - 2¹⁰ = 21033517 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74186 + ... + 74468.

It is an arithmetic number, because the mean of its divisors is an integer number (1495260).

Almost surely, 2^21034541 is an apocalyptic number.

It is an amenable number.

21034541 is a deficient number, since it is larger than the sum of its proper divisors (2889619).

21034541 is a wasteful number, since it uses less digits than its factorization.

21034541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556.

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

The square root of 21034541 is about 4586.3428785907. The cubic root of 21034541 is about 276.0435982726.

Adding to 21034541 its reverse (14543012), we get a palindrome (35577553).

The spelling of 21034541 in words is "twenty-one million, thirty-four thousand, five hundred forty-one".