1220212547857 has 2 divisors, whose sum is σ = 1220212547858. Its totient is φ = 1220212547856.

The previous prime is 1220212547843. The next prime is 1220212547867. The reversal of 1220212547857 is 7587452120221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1184159652481 + 36052895376 = 1088191^2 + 189876^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220212547857 - 2²³ = 1220204159249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220212547867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610106273928 + 610106273929.

It is an arithmetic number, because the mean of its divisors is an integer number (610106273929).

Almost surely, 2^{1220212547857} is an apocalyptic number.

It is an amenable number.

1220212547857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220212547857 is an equidigital number, since it uses as much as digits as its factorization.

1220212547857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 627200, while the sum is 46.

The spelling of 1220212547857 in words is "one trillion, two hundred twenty billion, two hundred twelve million, five hundred forty-seven thousand, eight hundred fifty-seven".