1221000017 has 2 divisors, whose sum is σ = 1221000018. Its totient is φ = 1221000016.

The previous prime is 1220999999. The next prime is 1221000029. The reversal of 1221000017 is 7100001221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1063346881 + 157653136 = 32609^2 + 12556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221000017 - 2⁶ = 1220999953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220999965 and 1221000010.

It is not a weakly prime, because it can be changed into another prime (1221009017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610500008 + 610500009.

It is an arithmetic number, because the mean of its divisors is an integer number (610500009).

Almost surely, 2^1221000017 is an apocalyptic number.

It is an amenable number.

1221000017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221000017 is an equidigital number, since it uses as much as digits as its factorization.

1221000017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 1221000017 is about 34942.8106625669. The cubic root of 1221000017 is about 1068.8216033921.

Adding to 1221000017 its reverse (7100001221), we get a palindrome (8321001238).

The spelling of 1221000017 in words is "one billion, two hundred twenty-one million, seventeen", and thus it is an aban number.