21102111001043 has 2 divisors, whose sum is σ = 21102111001044. Its totient is φ = 21102111001042.

The previous prime is 21102111000947. The next prime is 21102111001099. The reversal of 21102111001043 is 34010011120112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102111001043 - 2²⁶ = 21102043892179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102111001843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551055500521 + 10551055500522.

It is an arithmetic number, because the mean of its divisors is an integer number (10551055500522).

Almost surely, 2^{21102111001043} is an apocalyptic number.

21102111001043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102111001043 is an equidigital number, since it uses as much as digits as its factorization.

21102111001043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21102111001043 its reverse (34010011120112), we get a palindrome (55112122121155).

The spelling of 21102111001043 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, one thousand, forty-three".