121112120021 has 2 divisors, whose sum is σ = 121112120022. Its totient is φ = 121112120020.

The previous prime is 121112119951. The next prime is 121112120039. The reversal of 121112120021 is 120021211121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75674508100 + 45437611921 = 275090^2 + 213161^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112120021 - 2¹⁰ = 121112118997 is a prime.

It is a super-2 number, since 2×121112120021² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121112119978 and 121112120005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121112128021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60556060010 + 60556060011.

It is an arithmetic number, because the mean of its divisors is an integer number (60556060011).

Almost surely, 2^121112120021 is an apocalyptic number.

It is an amenable number.

121112120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121112120021 is an equidigital number, since it uses as much as digits as its factorization.

121112120021 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 121112120021 its reverse (120021211121), we get a palindrome (241133331142).

The spelling of 121112120021 in words is "one hundred twenty-one billion, one hundred twelve million, one hundred twenty thousand, twenty-one".