21001111063 has 2 divisors, whose sum is σ = 21001111064. Its totient is φ = 21001111062.

The previous prime is 21001110967. The next prime is 21001111067. The reversal of 21001111063 is 36011110012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001111063 - 2³³ = 12411176471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001111067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500555531 + 10500555532.

It is an arithmetic number, because the mean of its divisors is an integer number (10500555532).

Almost surely, 2^21001111063 is an apocalyptic number.

21001111063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001111063 is an equidigital number, since it uses as much as digits as its factorization.

21001111063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21001111063 its reverse (36011110012), we get a palindrome (57012221075).

The spelling of 21001111063 in words is "twenty-one billion, one million, one hundred eleven thousand, sixty-three".