121021021021 has 2 divisors, whose sum is σ = 121021021022. Its totient is φ = 121021021020.

The previous prime is 121021020949. The next prime is 121021021087. The reversal of 121021021021 is 120120120121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78630328921 + 42390692100 = 280411^2 + 205890^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021021021 - 2²¹ = 121018923869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121021020992 and 121021021010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121021021921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510510510 + 60510510511.

It is an arithmetic number, because the mean of its divisors is an integer number (60510510511).

Almost surely, 2^121021021021 is an apocalyptic number.

It is an amenable number.

121021021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021021021 is an equidigital number, since it uses as much as digits as its factorization.

121021021021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121021021021 its reverse (120120120121), we get a palindrome (241141141142).

The spelling of 121021021021 in words is "one hundred twenty-one billion, twenty-one million, twenty-one thousand, twenty-one".