221000201110081 has 2 divisors, whose sum is σ = 221000201110082. Its totient is φ = 221000201110080.

The previous prime is 221000201110079. The next prime is 221000201110123. The reversal of 221000201110081 is 180011102000122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207679226766400 + 13320974343681 = 14411080^2 + 3649791^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000201110081 - 2¹ = 221000201110079 is a prime.

It is a super-2 number, since 2×221000201110081² (a number of 29 digits) contains 22 as substring.

Together with 221000201110079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221000201110061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500100555040 + 110500100555041.

It is an arithmetic number, because the mean of its divisors is an integer number (110500100555041).

Almost surely, 2^{221000201110081} is an apocalyptic number.

It is an amenable number.

221000201110081 is a deficient number, since it is larger than the sum of its proper divisors (1).

221000201110081 is an equidigital number, since it uses as much as digits as its factorization.

221000201110081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

The spelling of 221000201110081 in words is "two hundred twenty-one trillion, two hundred one million, one hundred ten thousand, eighty-one".