121411021 has 2 divisors, whose sum is σ = 121411022. Its totient is φ = 121411020.

The previous prime is 121411019. The next prime is 121411051. The reversal of 121411021 is 120114121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106894921 + 14516100 = 10339^2 + 3810^2 .

It is an emirp because it is prime and its reverse (120114121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121411021 - 2¹ = 121411019 is a prime.

Together with 121411019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121410992 and 121411010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121411001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60705510 + 60705511.

It is an arithmetic number, because the mean of its divisors is an integer number (60705511).

Almost surely, 2^121411021 is an apocalyptic number.

It is an amenable number.

121411021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121411021 is an equidigital number, since it uses as much as digits as its factorization.

121411021 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 13.

The square root of 121411021 is about 11018.6669338900. Note that the first 3 decimals coincide. The cubic root of 121411021 is about 495.1681515586.

Adding to 121411021 its reverse (120114121), we get a palindrome (241525142).

The spelling of 121411021 in words is "one hundred twenty-one million, four hundred eleven thousand, twenty-one".