111221002117 has 2 divisors, whose sum is σ = 111221002118. Its totient is φ = 111221002116.

The previous prime is 111221002099. The next prime is 111221002121. The reversal of 111221002117 is 711200122111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101500225281 + 9720776836 = 318591^2 + 98594^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221002117 - 2¹⁹ = 111220477829 is a prime.

It is a super-2 number, since 2×111221002117² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111221002094 and 111221002103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221002157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610501058 + 55610501059.

It is an arithmetic number, because the mean of its divisors is an integer number (55610501059).

Almost surely, 2^111221002117 is an apocalyptic number.

It is an amenable number.

111221002117 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221002117 is an equidigital number, since it uses as much as digits as its factorization.

111221002117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 111221002117 its reverse (711200122111), we get a palindrome (822421124228).

The spelling of 111221002117 in words is "one hundred eleven billion, two hundred twenty-one million, two thousand, one hundred seventeen".