21011110201 has 2 divisors, whose sum is σ = 21011110202. Its totient is φ = 21011110200.

The previous prime is 21011110181. The next prime is 21011110231. The reversal of 21011110201 is 10201111012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12332324601 + 8678785600 = 111051^2 + 93160^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011110201 - 2¹⁵ = 21011077433 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011110231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505555100 + 10505555101.

It is an arithmetic number, because the mean of its divisors is an integer number (10505555101).

Almost surely, 2^21011110201 is an apocalyptic number.

It is an amenable number.

21011110201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011110201 is an equidigital number, since it uses as much as digits as its factorization.

21011110201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21011110201 its reverse (10201111012), we get a palindrome (31212221213).

The spelling of 21011110201 in words is "twenty-one billion, eleven million, one hundred ten thousand, two hundred one".