111220221251 has 2 divisors, whose sum is σ = 111220221252. Its totient is φ = 111220221250.

The previous prime is 111220221199. The next prime is 111220221271. The reversal of 111220221251 is 152122022111.

It is an a-pointer prime, because the next prime (111220221271) can be obtained adding 111220221251 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111220221251 - 2²⁶ = 111153112387 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (111220221271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610110625 + 55610110626.

It is an arithmetic number, because the mean of its divisors is an integer number (55610110626).

Almost surely, 2^111220221251 is an apocalyptic number.

111220221251 is a deficient number, since it is larger than the sum of its proper divisors (1).

111220221251 is an equidigital number, since it uses as much as digits as its factorization.

111220221251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 111220221251 its reverse (152122022111), we get a palindrome (263342243362).

The spelling of 111220221251 in words is "one hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, two hundred fifty-one".