21201041 has 2 divisors, whose sum is σ = 21201042. Its totient is φ = 21201040.

The previous prime is 21201031. The next prime is 21201067. The reversal of 21201041 is 14010212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21196816 + 4225 = 4604^2 + 65^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201041 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21201031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600520 + 10600521.

It is an arithmetic number, because the mean of its divisors is an integer number (10600521).

Almost surely, 2^21201041 is an apocalyptic number.

It is an amenable number.

21201041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201041 is an equidigital number, since it uses as much as digits as its factorization.

21201041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21201041 is about 4604.4588172770. The cubic root of 21201041 is about 276.7700307316.

Adding to 21201041 its reverse (14010212), we get a palindrome (35211253).

The spelling of 21201041 in words is "twenty-one million, two hundred one thousand, forty-one".