121201011221 has 2 divisors, whose sum is σ = 121201011222. Its totient is φ = 121201011220.

The previous prime is 121201011167. The next prime is 121201011257. The reversal of 121201011221 is 122110102121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119639892100 + 1561119121 = 345890^2 + 39511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121201011221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121201011196 and 121201011205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121201011821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600505610 + 60600505611.

It is an arithmetic number, because the mean of its divisors is an integer number (60600505611).

Almost surely, 2^121201011221 is an apocalyptic number.

It is an amenable number.

121201011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201011221 is an equidigital number, since it uses as much as digits as its factorization.

121201011221 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 121201011221 its reverse (122110102121), we get a palindrome (243311113342).

The spelling of 121201011221 in words is "one hundred twenty-one billion, two hundred one million, eleven thousand, two hundred twenty-one".