1220011220257 has 2 divisors, whose sum is σ = 1220011220258. Its totient is φ = 1220011220256.

The previous prime is 1220011220149. The next prime is 1220011220291. The reversal of 1220011220257 is 7520221100221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1194946314496 + 25064905761 = 1093136^2 + 158319^2 .

It is an emirp because it is prime and its reverse (7520221100221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220011220257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220011220357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610005610128 + 610005610129.

It is an arithmetic number, because the mean of its divisors is an integer number (610005610129).

Almost surely, 2^{1220011220257} is an apocalyptic number.

It is an amenable number.

1220011220257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220011220257 is an equidigital number, since it uses as much as digits as its factorization.

1220011220257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 1220011220257 its reverse (7520221100221), we get a palindrome (8740232320478).

The spelling of 1220011220257 in words is "one trillion, two hundred twenty billion, eleven million, two hundred twenty thousand, two hundred fifty-seven".