111020110001221 has 2 divisors, whose sum is σ = 111020110001222. Its totient is φ = 111020110001220.

The previous prime is 111020110001209. The next prime is 111020110001257. The reversal of 111020110001221 is 122100011020111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101294381669121 + 9725728332100 = 10064511^2 + 3118610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111020110001221 is a prime.

It is a super-2 number, since 2×111020110001221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111020110001621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510055000610 + 55510055000611.

It is an arithmetic number, because the mean of its divisors is an integer number (55510055000611).

Almost surely, 2^{111020110001221} is an apocalyptic number.

It is an amenable number.

111020110001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111020110001221 is an equidigital number, since it uses as much as digits as its factorization.

111020110001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111020110001221 its reverse (122100011020111), we get a palindrome (233120121021332).

The spelling of 111020110001221 in words is "one hundred eleven trillion, twenty billion, one hundred ten million, one thousand, two hundred twenty-one".