21011211041 has 2 divisors, whose sum is σ = 21011211042. Its totient is φ = 21011211040.

The previous prime is 21011211029. The next prime is 21011211077. The reversal of 21011211041 is 14011211012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17692990225 + 3318220816 = 133015^2 + 57604^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011211041 - 2¹⁴ = 21011194657 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011211241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505605520 + 10505605521.

It is an arithmetic number, because the mean of its divisors is an integer number (10505605521).

Almost surely, 2^21011211041 is an apocalyptic number.

It is an amenable number.

21011211041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011211041 is an equidigital number, since it uses as much as digits as its factorization.

21011211041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21011211041 its reverse (14011211012), we get a palindrome (35022422053).

The spelling of 21011211041 in words is "twenty-one billion, eleven million, two hundred eleven thousand, forty-one".