21201110219077 has 2 divisors, whose sum is σ = 21201110219078. Its totient is φ = 21201110219076.

The previous prime is 21201110219071. The next prime is 21201110219087. The reversal of 21201110219077 is 77091201110212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21137199345441 + 63910873636 = 4597521^2 + 252806^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201110219077 - 2¹¹ = 21201110217029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201110219071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600555109538 + 10600555109539.

It is an arithmetic number, because the mean of its divisors is an integer number (10600555109539).

Almost surely, 2^{21201110219077} is an apocalyptic number.

It is an amenable number.

21201110219077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201110219077 is an equidigital number, since it uses as much as digits as its factorization.

21201110219077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 34.

Adding to 21201110219077 its reverse (77091201110212), we get a palindrome (98292311329289).

The spelling of 21201110219077 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, two hundred nineteen thousand, seventy-seven".