21011063 has 2 divisors, whose sum is σ = 21011064. Its totient is φ = 21011062.

The previous prime is 21011033. The next prime is 21011071. The reversal of 21011063 is 36011012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011063 - 2¹² = 21006967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505531 + 10505532.

It is an arithmetic number, because the mean of its divisors is an integer number (10505532).

Almost surely, 2^21011063 is an apocalyptic number.

21011063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011063 is an equidigital number, since it uses as much as digits as its factorization.

21011063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21011063 is about 4583.7826082833. The cubic root of 21011063 is about 275.9408567174.

Adding to 21011063 its reverse (36011012), we get a palindrome (57022075).

The spelling of 21011063 in words is "twenty-one million, eleven thousand, sixty-three".