121101121021 has 2 divisors, whose sum is σ = 121101121022. Its totient is φ = 121101121020.

The previous prime is 121101120997. The next prime is 121101121051. The reversal of 121101121021 is 120121101121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66478887225 + 54622233796 = 257835^2 + 233714^2 .

It is a cyclic number.

It is not a de Polignac number, because 121101121021 - 2⁷ = 121101120893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121101120992 and 121101121010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121101121051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550560510 + 60550560511.

It is an arithmetic number, because the mean of its divisors is an integer number (60550560511).

Almost surely, 2^121101121021 is an apocalyptic number.

It is an amenable number.

121101121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121101121021 is an equidigital number, since it uses as much as digits as its factorization.

121101121021 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 121101121021 its reverse (120121101121), we get a palindrome (241222222142).

The spelling of 121101121021 in words is "one hundred twenty-one billion, one hundred one million, one hundred twenty-one thousand, twenty-one".