120021121111 has 2 divisors, whose sum is σ = 120021121112. Its totient is φ = 120021121110.

The previous prime is 120021121067. The next prime is 120021121123. The reversal of 120021121111 is 111121120021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 120021121111 - 2¹¹ = 120021119063 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 120021121091 and 120021121100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120021521111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60010560555 + 60010560556.

It is an arithmetic number, because the mean of its divisors is an integer number (60010560556).

Almost surely, 2^120021121111 is an apocalyptic number.

120021121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

120021121111 is an equidigital number, since it uses as much as digits as its factorization.

120021121111 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 120021121111 its reverse (111121120021), we get a palindrome (231142241132).

The spelling of 120021121111 in words is "one hundred twenty billion, twenty-one million, one hundred twenty-one thousand, one hundred eleven".