1221222122177 has 2 divisors, whose sum is σ = 1221222122178. Its totient is φ = 1221222122176.

The previous prime is 1221222122117. The next prime is 1221222122209. The reversal of 1221222122177 is 7712212221221.

It is a happy number.

It is an a-pointer prime, because the next prime (1221222122209) can be obtained adding 1221222122177 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1106786057521 + 114436064656 = 1052039^2 + 338284^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221222122177 - 2²⁸ = 1220953686721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221222122117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611061088 + 610611061089.

It is an arithmetic number, because the mean of its divisors is an integer number (610611061089).

Almost surely, 2^{1221222122177} is an apocalyptic number.

It is an amenable number.

1221222122177 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222122177 is an equidigital number, since it uses as much as digits as its factorization.

1221222122177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 32.

Adding to 1221222122177 its reverse (7712212221221), we get a palindrome (8933434343398).

The spelling of 1221222122177 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred seventy-seven".