1011601022221 has 2 divisors, whose sum is σ = 1011601022222. Its totient is φ = 1011601022220.

The previous prime is 1011601022219. The next prime is 1011601022291. The reversal of 1011601022221 is 1222201061101.

1011601022221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972600302025 + 39000720196 = 986205^2 + 197486^2 .

It is an emirp because it is prime and its reverse (1222201061101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1011601022221 - 2¹ = 1011601022219 is a prime.

Together with 1011601022219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011601022291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505800511110 + 505800511111.

It is an arithmetic number, because the mean of its divisors is an integer number (505800511111).

Almost surely, 2^{1011601022221} is an apocalyptic number.

It is an amenable number.

1011601022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011601022221 is an equidigital number, since it uses as much as digits as its factorization.

1011601022221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1011601022221 its reverse (1222201061101), we get a palindrome (2233802083322).

The spelling of 1011601022221 in words is "one trillion, eleven billion, six hundred one million, twenty-two thousand, two hundred twenty-one".