1220121017 has 2 divisors, whose sum is σ = 1220121018. Its totient is φ = 1220121016.

The previous prime is 1220120989. The next prime is 1220121037. The reversal of 1220121017 is 7101210221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1047881641 + 172239376 = 32371^2 + 13124^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220121017 - 2¹⁰ = 1220119993 is a prime.

It is a super-2 number, since 2×1220121017² = 2977390592250228578, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220120986 and 1220121004.

It is not a weakly prime, because it can be changed into another prime (1220121037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610060508 + 610060509.

It is an arithmetic number, because the mean of its divisors is an integer number (610060509).

Almost surely, 2^1220121017 is an apocalyptic number.

It is an amenable number.

1220121017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220121017 is an equidigital number, since it uses as much as digits as its factorization.

1220121017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 1220121017 is about 34930.2307035038. The cubic root of 1220121017 is about 1068.5650596535.

Adding to 1220121017 its reverse (7101210221), we get a palindrome (8321331238).

The spelling of 1220121017 in words is "one billion, two hundred twenty million, one hundred twenty-one thousand, seventeen".