111221102021 has 2 divisors, whose sum is σ = 111221102022. Its totient is φ = 111221102020.

The previous prime is 111221101969. The next prime is 111221102059. The reversal of 111221102021 is 120201122111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80889048100 + 30332053921 = 284410^2 + 174161^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221102021 - 2¹⁰ = 111221100997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111221101987 and 111221102005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221104021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610551010 + 55610551011.

It is an arithmetic number, because the mean of its divisors is an integer number (55610551011).

Almost surely, 2^111221102021 is an apocalyptic number.

It is an amenable number.

111221102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221102021 is an equidigital number, since it uses as much as digits as its factorization.

111221102021 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 14.

Adding to 111221102021 its reverse (120201122111), we get a palindrome (231422224132).

The spelling of 111221102021 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred two thousand, twenty-one".