111111222212021 has 2 divisors, whose sum is σ = 111111222212022. Its totient is φ = 111111222212020.

The previous prime is 111111222212017. The next prime is 111111222212059. The reversal of 111111222212021 is 120212222111111.

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., 63110075314225 + 48001146897796 = 7944185^2 + 6928286^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111222212021 - 2² = 111111222212017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111111222211984 and 111111222212002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111222212071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555611106010 + 55555611106011.

It is an arithmetic number, because the mean of its divisors is an integer number (55555611106011).

Almost surely, 2^{111111222212021} is an apocalyptic number.

It is an amenable number.

111111222212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111222212021 is an equidigital number, since it uses as much as digits as its factorization.

111111222212021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111111222212021 its reverse (120212222111111), we get a palindrome (231323444323132).

The spelling of 111111222212021 in words is "one hundred eleven trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twelve thousand, twenty-one".