121010221121 has 2 divisors, whose sum is σ = 121010221122. Its totient is φ = 121010221120.

The previous prime is 121010221099. The next prime is 121010221139. The reversal of 121010221121 is 121122010121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113006234896 + 8003986225 = 336164^2 + 89465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121010221121 is a prime.

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 = 121010221096 and 121010221105.

It is not a weakly prime, because it can be changed into another prime (121010221921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505110560 + 60505110561.

It is an arithmetic number, because the mean of its divisors is an integer number (60505110561).

Almost surely, 2^121010221121 is an apocalyptic number.

It is an amenable number.

121010221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121010221121 is an equidigital number, since it uses as much as digits as its factorization.

121010221121 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 14.

Adding to 121010221121 its reverse (121122010121), we get a palindrome (242132231242).

The spelling of 121010221121 in words is "one hundred twenty-one billion, ten million, two hundred twenty-one thousand, one hundred twenty-one".