1221230309177 has 2 divisors, whose sum is σ = 1221230309178. Its totient is φ = 1221230309176.

The previous prime is 1221230309147. The next prime is 1221230309179. The reversal of 1221230309177 is 7719030321221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1165819032361 + 55411276816 = 1079731^2 + 235396^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221230309177 - 2³⁰ = 1220156567353 is a prime.

Together with 1221230309179, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221230309177.

It is not a weakly prime, because it can be changed into another prime (1221230309179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610615154588 + 610615154589.

It is an arithmetic number, because the mean of its divisors is an integer number (610615154589).

Almost surely, 2^{1221230309177} is an apocalyptic number.

It is an amenable number.

1221230309177 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221230309177 is an equidigital number, since it uses as much as digits as its factorization.

1221230309177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The spelling of 1221230309177 in words is "one trillion, two hundred twenty-one billion, two hundred thirty million, three hundred nine thousand, one hundred seventy-seven".