111111010022261 has 2 divisors, whose sum is σ = 111111010022262. Its totient is φ = 111111010022260.

The previous prime is 111111010022183. The next prime is 111111010022291. The reversal of 111111010022261 is 162220010111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74052805895236 + 37058204127025 = 8605394^2 + 6087545^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111010022261 - 2¹⁰ = 111111010021237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111010022291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555505011130 + 55555505011131.

It is an arithmetic number, because the mean of its divisors is an integer number (55555505011131).

Almost surely, 2^{111111010022261} is an apocalyptic number.

It is an amenable number.

111111010022261 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111010022261 is an equidigital number, since it uses as much as digits as its factorization.

111111010022261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 111111010022261 its reverse (162220010111111), we get a palindrome (273331020133372).

The spelling of 111111010022261 in words is "one hundred eleven trillion, one hundred eleven billion, ten million, twenty-two thousand, two hundred sixty-one".