21002100111023 has 2 divisors, whose sum is σ = 21002100111024. Its totient is φ = 21002100111022.

The previous prime is 21002100110993. The next prime is 21002100111029. The reversal of 21002100111023 is 32011100120012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002100111023 - 2⁸ = 21002100110767 is a prime.

It is a super-2 number, since 2×21002100111023² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002100110989 and 21002100111007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002100111029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501050055511 + 10501050055512.

It is an arithmetic number, because the mean of its divisors is an integer number (10501050055512).

Almost surely, 2^{21002100111023} is an apocalyptic number.

21002100111023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002100111023 is an equidigital number, since it uses as much as digits as its factorization.

21002100111023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21002100111023 its reverse (32011100120012), we get a palindrome (53013200231035).

The spelling of 21002100111023 in words is "twenty-one trillion, two billion, one hundred million, one hundred eleven thousand, twenty-three".