111001022261 has 2 divisors, whose sum is σ = 111001022262. Its totient is φ = 111001022260.

The previous prime is 111001022207. The next prime is 111001022263. The reversal of 111001022261 is 162220100111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102432002500 + 8569019761 = 320050^2 + 92569^2 .

It is a cyclic number.

It is not a de Polignac number, because 111001022261 - 2²² = 110996827957 is a prime.

Together with 111001022263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111001022263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55500511130 + 55500511131.

It is an arithmetic number, because the mean of its divisors is an integer number (55500511131).

Almost surely, 2^111001022261 is an apocalyptic number.

It is an amenable number.

111001022261 is a deficient number, since it is larger than the sum of its proper divisors (1).

111001022261 is an equidigital number, since it uses as much as digits as its factorization.

111001022261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 111001022261 its reverse (162220100111), we get a palindrome (273221122372).

The spelling of 111001022261 in words is "one hundred eleven billion, one million, twenty-two thousand, two hundred sixty-one".