21011211012073 has 2 divisors, whose sum is σ = 21011211012074. Its totient is φ = 21011211012072.

The previous prime is 21011211011977. The next prime is 21011211012079. The reversal of 21011211012073 is 37021011211012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20233830229209 + 777380782864 = 4498203^2 + 881692^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011211012073 - 2²⁹ = 21010674141161 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011211012079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505605506036 + 10505605506037.

It is an arithmetic number, because the mean of its divisors is an integer number (10505605506037).

Almost surely, 2^{21011211012073} is an apocalyptic number.

It is an amenable number.

21011211012073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011211012073 is an equidigital number, since it uses as much as digits as its factorization.

21011211012073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 22.

Adding to 21011211012073 its reverse (37021011211012), we get a palindrome (58032222223085).

The spelling of 21011211012073 in words is "twenty-one trillion, eleven billion, two hundred eleven million, twelve thousand, seventy-three".