21711222080641 has 2 divisors, whose sum is σ = 21711222080642. Its totient is φ = 21711222080640.

The previous prime is 21711222080599. The next prime is 21711222080663. The reversal of 21711222080641 is 14608022211712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16625313082225 + 5085908998416 = 4077415^2 + 2255196^2 .

It is a cyclic number.

It is not a de Polignac number, because 21711222080641 - 2¹¹ = 21711222078593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21711222080641.

It is not a weakly prime, because it can be changed into another prime (21711222080741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10855611040320 + 10855611040321.

It is an arithmetic number, because the mean of its divisors is an integer number (10855611040321).

Almost surely, 2^{21711222080641} is an apocalyptic number.

It is an amenable number.

21711222080641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21711222080641 is an equidigital number, since it uses as much as digits as its factorization.

21711222080641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 21711222080641 in words is "twenty-one trillion, seven hundred eleven billion, two hundred twenty-two million, eighty thousand, six hundred forty-one".