111220202222021 has 2 divisors, whose sum is σ = 111220202222022. Its totient is φ = 111220202222020.

The previous prime is 111220202222009. The next prime is 111220202222023. The reversal of 111220202222021 is 120222202022111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61498312831396 + 49721889390625 = 7842086^2 + 7051375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111220202222021 is a prime.

Together with 111220202222023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 111220202221984 and 111220202222002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111220202222023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610101111010 + 55610101111011.

It is an arithmetic number, because the mean of its divisors is an integer number (55610101111011).

Almost surely, 2^{111220202222021} is an apocalyptic number.

It is an amenable number.

111220202222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111220202222021 is an equidigital number, since it uses as much as digits as its factorization.

111220202222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 111220202222021 its reverse (120222202022111), we get a palindrome (231442404244132).

The spelling of 111220202222021 in words is "one hundred eleven trillion, two hundred twenty billion, two hundred two million, two hundred twenty-two thousand, twenty-one".