111022010121821 has 2 divisors, whose sum is σ = 111022010121822. Its totient is φ = 111022010121820.

The previous prime is 111022010121817. The next prime is 111022010121829. The reversal of 111022010121821 is 128121010220111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98600650005796 + 12421360116025 = 9929786^2 + 3524395^2 .

It is a cyclic number.

It is not a de Polignac number, because 111022010121821 - 2² = 111022010121817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111022010121829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55511005060910 + 55511005060911.

It is an arithmetic number, because the mean of its divisors is an integer number (55511005060911).

Almost surely, 2^{111022010121821} is an apocalyptic number.

It is an amenable number.

111022010121821 is a deficient number, since it is larger than the sum of its proper divisors (1).

111022010121821 is an equidigital number, since it uses as much as digits as its factorization.

111022010121821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 23.

Adding to 111022010121821 its reverse (128121010220111), we get a palindrome (239143020341932).

The spelling of 111022010121821 in words is "one hundred eleven trillion, twenty-two billion, ten million, one hundred twenty-one thousand, eight hundred twenty-one".