77112022012121 has 2 divisors, whose sum is σ = 77112022012122. Its totient is φ = 77112022012120.

The previous prime is 77112022012087. The next prime is 77112022012141. The reversal of 77112022012121 is 12121022021177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60780562923721 + 16331459088400 = 7796189^2 + 4041220^2 .

It is an emirp because it is prime and its reverse (12121022021177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77112022012121 - 2⁶ = 77112022012057 is a prime.

It is not a weakly prime, because it can be changed into another prime (77112022012141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38556011006060 + 38556011006061.

It is an arithmetic number, because the mean of its divisors is an integer number (38556011006061).

Almost surely, 2^{77112022012121} is an apocalyptic number.

It is an amenable number.

77112022012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77112022012121 is an equidigital number, since it uses as much as digits as its factorization.

77112022012121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 29.

Adding to 77112022012121 its reverse (12121022021177), we get a palindrome (89233044033298).

The spelling of 77112022012121 in words is "seventy-seven trillion, one hundred twelve billion, twenty-two million, twelve thousand, one hundred twenty-one".