121130221 has 2 divisors, whose sum is σ = 121130222. Its totient is φ = 121130220.

The previous prime is 121130203. The next prime is 121130239. The reversal of 121130221 is 122031121.

It is a balanced prime because it is at equal distance from previous prime (121130203) and next prime (121130239).

It can be written as a sum of positive squares in only one way, i.e., 120758121 + 372100 = 10989^2 + 610^2 .

It is an emirp because it is prime and its reverse (122031121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121130221 - 2¹⁵ = 121097453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121130521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60565110 + 60565111.

It is an arithmetic number, because the mean of its divisors is an integer number (60565111).

Almost surely, 2^121130221 is an apocalyptic number.

It is an amenable number.

121130221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121130221 is an equidigital number, since it uses as much as digits as its factorization.

121130221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 121130221 is about 11005.9175446666. The cubic root of 121130221 is about 494.7861144447.

Adding to 121130221 its reverse (122031121), we get a palindrome (243161342).

The spelling of 121130221 in words is "one hundred twenty-one million, one hundred thirty thousand, two hundred twenty-one".