21110111041 has 2 divisors, whose sum is σ = 21110111042. Its totient is φ = 21110111040.

The previous prime is 21110111003. The next prime is 21110111047. The reversal of 21110111041 is 14011101112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20874181441 + 235929600 = 144479^2 + 15360^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110111041 - 2⁷ = 21110110913 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110111047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555055520 + 10555055521.

It is an arithmetic number, because the mean of its divisors is an integer number (10555055521).

Almost surely, 2^21110111041 is an apocalyptic number.

It is an amenable number.

21110111041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110111041 is an equidigital number, since it uses as much as digits as its factorization.

21110111041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21110111041 its reverse (14011101112), we get a palindrome (35121212153).

The spelling of 21110111041 in words is "twenty-one billion, one hundred ten million, one hundred eleven thousand, forty-one".