21111002063 has 2 divisors, whose sum is σ = 21111002064. Its totient is φ = 21111002062.

The previous prime is 21111002039. The next prime is 21111002117. The reversal of 21111002063 is 36020011112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111002063 - 2¹² = 21110997967 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111002963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555501031 + 10555501032.

It is an arithmetic number, because the mean of its divisors is an integer number (10555501032).

Almost surely, 2^21111002063 is an apocalyptic number.

21111002063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111002063 is an equidigital number, since it uses as much as digits as its factorization.

21111002063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21111002063 its reverse (36020011112), we get a palindrome (57131013175).

The spelling of 21111002063 in words is "twenty-one billion, one hundred eleven million, two thousand, sixty-three".