121221220873 has 2 divisors, whose sum is σ = 121221220874. Its totient is φ = 121221220872.

The previous prime is 121221220823. The next prime is 121221220877. The reversal of 121221220873 is 378022122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66583093369 + 54638127504 = 258037^2 + 233748^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221220873 - 2²⁵ = 121187666441 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221220877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610610436 + 60610610437.

It is an arithmetic number, because the mean of its divisors is an integer number (60610610437).

Almost surely, 2^121221220873 is an apocalyptic number.

It is an amenable number.

121221220873 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221220873 is an equidigital number, since it uses as much as digits as its factorization.

121221220873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

Adding to 121221220873 its reverse (378022122121), we get a palindrome (499243342994).

The spelling of 121221220873 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, eight hundred seventy-three".