111102220121021 has 2 divisors, whose sum is σ = 111102220121022. Its totient is φ = 111102220121020.

The previous prime is 111102220120999. The next prime is 111102220121023. The reversal of 111102220121021 is 120121022201111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97558981068025 + 13543239052996 = 9877195^2 + 3680114^2 .

It is a cyclic number.

It is not a de Polignac number, because 111102220121021 - 2¹⁴ = 111102220104637 is a prime.

Together with 111102220121023, 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 (111102220121023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55551110060510 + 55551110060511.

It is an arithmetic number, because the mean of its divisors is an integer number (55551110060511).

Almost surely, 2^{111102220121021} is an apocalyptic number.

It is an amenable number.

111102220121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111102220121021 is an equidigital number, since it uses as much as digits as its factorization.

111102220121021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111102220121021 its reverse (120121022201111), we get a palindrome (231223242322132).

The spelling of 111102220121021 in words is "one hundred eleven trillion, one hundred two billion, two hundred twenty million, one hundred twenty-one thousand, twenty-one".