774220121 has 2 divisors, whose sum is σ = 774220122. Its totient is φ = 774220120.

The previous prime is 774220091. The next prime is 774220123. The reversal of 774220121 is 121022477.

774220121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 550418521 + 223801600 = 23461^2 + 14960^2 .

It is an emirp because it is prime and its reverse (121022477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 774220121 - 2¹⁰ = 774219097 is a prime.

It is a super-2 number, since 2×774220121² = 1198833591522509282, which contains 22 as substring.

Together with 774220123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (774220123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387110060 + 387110061.

It is an arithmetic number, because the mean of its divisors is an integer number (387110061).

Almost surely, 2^774220121 is an apocalyptic number.

It is an amenable number.

774220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

774220121 is an equidigital number, since it uses as much as digits as its factorization.

774220121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 774220121 is about 27824.8112482367. The cubic root of 774220121 is about 918.2370622790.

Adding to 774220121 its reverse (121022477), we get a palindrome (895242598).

The spelling of 774220121 in words is "seven hundred seventy-four million, two hundred twenty thousand, one hundred twenty-one".