120021111121 has 2 divisors, whose sum is σ = 120021111122. Its totient is φ = 120021111120.

The previous prime is 120021111097. The next prime is 120021111127. The reversal of 120021111121 is 121111120021.

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., 84892980496 + 35128130625 = 291364^2 + 187425^2 .

It is a cyclic number.

It is not a de Polignac number, because 120021111121 - 2¹¹ = 120021109073 is a prime.

It is a super-2 number, since 2×120021111121² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (120021111127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60010555560 + 60010555561.

It is an arithmetic number, because the mean of its divisors is an integer number (60010555561).

Almost surely, 2^120021111121 is an apocalyptic number.

It is an amenable number.

120021111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

120021111121 is an equidigital number, since it uses as much as digits as its factorization.

120021111121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 120021111121 its reverse (121111120021), we get a palindrome (241132231142).

The spelling of 120021111121 in words is "one hundred twenty billion, twenty-one million, one hundred eleven thousand, one hundred twenty-one".