111201220120021 has 2 divisors, whose sum is σ = 111201220120022. Its totient is φ = 111201220120020.

The previous prime is 111201220120013. The next prime is 111201220120031. The reversal of 111201220120021 is 120021022102111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86287285919025 + 24913934200996 = 9289095^2 + 4991386^2 .

It is a cyclic number.

It is not a de Polignac number, because 111201220120021 - 2³ = 111201220120013 is a prime.

It is a super-2 number, since 2×111201220120021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111201220119977 and 111201220120004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111201220120031) 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, 55600610060010 + 55600610060011.

It is an arithmetic number, because the mean of its divisors is an integer number (55600610060011).

Almost surely, 2^{111201220120021} is an apocalyptic number.

It is an amenable number.

111201220120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111201220120021 is an equidigital number, since it uses as much as digits as its factorization.

111201220120021 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 16.

Adding to 111201220120021 its reverse (120021022102111), we get a palindrome (231222242222132).

The spelling of 111201220120021 in words is "one hundred eleven trillion, two hundred one billion, two hundred twenty million, one hundred twenty thousand, twenty-one".