21062801 has 2 divisors, whose sum is σ = 21062802. Its totient is φ = 21062800.

The previous prime is 21062761. The next prime is 21062851. The reversal of 21062801 is 10826012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18931201 + 2131600 = 4351^2 + 1460^2 .

It is a cyclic number.

It is not a de Polignac number, because 21062801 - 2⁶ = 21062737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21062851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10531400 + 10531401.

It is an arithmetic number, because the mean of its divisors is an integer number (10531401).

Almost surely, 2^21062801 is an apocalyptic number.

It is an amenable number.

21062801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21062801 is an equidigital number, since it uses as much as digits as its factorization.

21062801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21062801 is about 4589.4227305839. The cubic root of 21062801 is about 276.1671648884.

Adding to 21062801 its reverse (10826012), we get a palindrome (31888813).

The spelling of 21062801 in words is "twenty-one million, sixty-two thousand, eight hundred one".