111121012021 has 2 divisors, whose sum is σ = 111121012022. Its totient is φ = 111121012020.

The previous prime is 111121011979. The next prime is 111121012039. The reversal of 111121012021 is 120210121111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102967824996 + 8153187025 = 320886^2 + 90295^2 .

It is a cyclic number.

It is not a de Polignac number, because 111121012021 - 2⁹ = 111121011509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111121011992 and 111121012010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111121012621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55560506010 + 55560506011.

It is an arithmetic number, because the mean of its divisors is an integer number (55560506011).

Almost surely, 2^111121012021 is an apocalyptic number.

It is an amenable number.

111121012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111121012021 is an equidigital number, since it uses as much as digits as its factorization.

111121012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111121012021 its reverse (120210121111), we get a palindrome (231331133132).

The spelling of 111121012021 in words is "one hundred eleven billion, one hundred twenty-one million, twelve thousand, twenty-one".