1221123317 has 2 divisors, whose sum is σ = 1221123318. Its totient is φ = 1221123316.

The previous prime is 1221123257. The next prime is 1221123349. The reversal of 1221123317 is 7133211221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 673610116 + 547513201 = 25954^2 + 23399^2 .

It is an emirp because it is prime and its reverse (7133211221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221123317 - 2²² = 1216929013 is a prime.

It is a super-2 number, since 2×1221123317² = 2982284310642164978, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221123292 and 1221123301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221123367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610561658 + 610561659.

It is an arithmetic number, because the mean of its divisors is an integer number (610561659).

Almost surely, 2^1221123317 is an apocalyptic number.

It is an amenable number.

1221123317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221123317 is an equidigital number, since it uses as much as digits as its factorization.

1221123317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 23.

The square root of 1221123317 is about 34944.5749294508. The cubic root of 1221123317 is about 1068.8575797137.

Adding to 1221123317 its reverse (7133211221), we get a palindrome (8354334538).

The spelling of 1221123317 in words is "one billion, two hundred twenty-one million, one hundred twenty-three thousand, three hundred seventeen".