111220202221021 has 2 divisors, whose sum is σ = 111220202221022. Its totient is φ = 111220202221020.

The previous prime is 111220202220991. The next prime is 111220202221049. The reversal of 111220202221021 is 120122202022111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109651160388025 + 1569041832996 = 10471445^2 + 1252614^2 .

It is an emirp because it is prime and its reverse (120122202022111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111220202221021 - 2¹⁷ = 111220202089949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111220202221021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111220202222021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610101110510 + 55610101110511.

It is an arithmetic number, because the mean of its divisors is an integer number (55610101110511).

Almost surely, 2^{111220202221021} is an apocalyptic number.

It is an amenable number.

111220202221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111220202221021 is an equidigital number, since it uses as much as digits as its factorization.

111220202221021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 111220202221021 its reverse (120122202022111), we get a palindrome (231342404243132).

The spelling of 111220202221021 in words is "one hundred eleven trillion, two hundred twenty billion, two hundred two million, two hundred twenty-one thousand, twenty-one".