111121001012221 has 2 divisors, whose sum is σ = 111121001012222. Its totient is φ = 111121001012220.

The previous prime is 111121001012209. The next prime is 111121001012303. The reversal of 111121001012221 is 122210100121111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82923424812900 + 28197576199321 = 9106230^2 + 5310139^2 .

It is a cyclic number.

It is not a de Polignac number, because 111121001012221 - 2³⁷ = 110983562058749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111121001012195 and 111121001012204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111121001022221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55560500506110 + 55560500506111.

It is an arithmetic number, because the mean of its divisors is an integer number (55560500506111).

Almost surely, 2^{111121001012221} is an apocalyptic number.

It is an amenable number.

111121001012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111121001012221 is an equidigital number, since it uses as much as digits as its factorization.

111121001012221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 111121001012221 its reverse (122210100121111), we get a palindrome (233331101133332).

The spelling of 111121001012221 in words is "one hundred eleven trillion, one hundred twenty-one billion, one million, twelve thousand, two hundred twenty-one".