1213221017 has 2 divisors, whose sum is σ = 1213221018. Its totient is φ = 1213221016.

The previous prime is 1213221013. The next prime is 1213221029. The reversal of 1213221017 is 7101223121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 963233296 + 249987721 = 31036^2 + 15811^2 .

It is an emirp because it is prime and its reverse (7101223121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213221017 - 2² = 1213221013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213221017.

It is not a weakly prime, because it can be changed into another prime (1213221013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606610508 + 606610509.

It is an arithmetic number, because the mean of its divisors is an integer number (606610509).

Almost surely, 2^1213221017 is an apocalyptic number.

It is an amenable number.

1213221017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213221017 is an equidigital number, since it uses as much as digits as its factorization.

1213221017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 1213221017 is about 34831.3223550298. The cubic root of 1213221017 is about 1066.5469424978.

Adding to 1213221017 its reverse (7101223121), we get a palindrome (8314444138).

The spelling of 1213221017 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, seventeen".