121228813 has 2 divisors, whose sum is σ = 121228814. Its totient is φ = 121228812.

The previous prime is 121228801. The next prime is 121228823. The reversal of 121228813 is 318822121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81324324 + 39904489 = 9018^2 + 6317^2 .

It is a cyclic number.

It is not a de Polignac number, because 121228813 - 2⁵ = 121228781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121228823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60614406 + 60614407.

It is an arithmetic number, because the mean of its divisors is an integer number (60614407).

Almost surely, 2^121228813 is an apocalyptic number.

It is an amenable number.

121228813 is a deficient number, since it is larger than the sum of its proper divisors (1).

121228813 is an equidigital number, since it uses as much as digits as its factorization.

121228813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 28.

The square root of 121228813 is about 11010.3956786303. The cubic root of 121228813 is about 494.9203191133.

The spelling of 121228813 in words is "one hundred twenty-one million, two hundred twenty-eight thousand, eight hundred thirteen".