21060001 has 2 divisors, whose sum is σ = 21060002. Its totient is φ = 21060000.

The previous prime is 21059977. The next prime is 21060023. The reversal of 21060001 is 10006012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16394401 + 4665600 = 4049^2 + 2160^2 .

It is a cyclic number.

It is not a de Polignac number, because 21060001 - 2¹³ = 21051809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21060001.

It is not a weakly prime, because it can be changed into another prime (21060401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10530000 + 10530001.

It is an arithmetic number, because the mean of its divisors is an integer number (10530001).

Almost surely, 2^21060001 is an apocalyptic number.

It is an amenable number.

21060001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21060001 is an equidigital number, since it uses as much as digits as its factorization.

21060001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21060001 is about 4589.1176711869. The cubic root of 21060001 is about 276.1549268464.

Adding to 21060001 its reverse (10006012), we get a palindrome (31066013).

The spelling of 21060001 in words is "twenty-one million, sixty thousand, one".