21060541 has 2 divisors, whose sum is σ = 21060542. Its totient is φ = 21060540.

The previous prime is 21060539. The next prime is 21060551. The reversal of 21060541 is 14506012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11758041 + 9302500 = 3429^2 + 3050^2 .

It is a cyclic number.

It is not a de Polignac number, because 21060541 - 2¹ = 21060539 is a prime.

Together with 21060539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21060551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10530270 + 10530271.

It is an arithmetic number, because the mean of its divisors is an integer number (10530271).

Almost surely, 2^21060541 is an apocalyptic number.

It is an amenable number.

21060541 is a deficient number, since it is larger than the sum of its proper divisors (1).

21060541 is an equidigital number, since it uses as much as digits as its factorization.

21060541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21060541 is about 4589.1765056489. The cubic root of 21060541 is about 276.1572871246.

Adding to 21060541 its reverse (14506012), we get a palindrome (35566553).

The spelling of 21060541 in words is "twenty-one million, sixty thousand, five hundred forty-one".