111012122261 has 2 divisors, whose sum is σ = 111012122262. Its totient is φ = 111012122260.

The previous prime is 111012122239. The next prime is 111012122327. The reversal of 111012122261 is 162221210111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98976935236 + 12035187025 = 314606^2 + 109705^2 .

It is a cyclic number.

It is not a de Polignac number, because 111012122261 - 2²² = 111007927957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111012122461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55506061130 + 55506061131.

It is an arithmetic number, because the mean of its divisors is an integer number (55506061131).

Almost surely, 2^111012122261 is an apocalyptic number.

It is an amenable number.

111012122261 is a deficient number, since it is larger than the sum of its proper divisors (1).

111012122261 is an equidigital number, since it uses as much as digits as its factorization.

111012122261 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 20.

Adding to 111012122261 its reverse (162221210111), we get a palindrome (273233332372).

The spelling of 111012122261 in words is "one hundred eleven billion, twelve million, one hundred twenty-two thousand, two hundred sixty-one".