1221200000017 has 2 divisors, whose sum is σ = 1221200000018. Its totient is φ = 1221200000016.

The previous prime is 1221200000011. The next prime is 1221200000081. The reversal of 1221200000017 is 7100000021221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 849860890641 + 371339109376 = 921879^2 + 609376^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221200000017 - 2⁷ = 1221199999889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221200000011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600000008 + 610600000009.

It is an arithmetic number, because the mean of its divisors is an integer number (610600000009).

Almost surely, 2^{1221200000017} is an apocalyptic number.

It is an amenable number.

1221200000017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221200000017 is an equidigital number, since it uses as much as digits as its factorization.

1221200000017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 1221200000017 its reverse (7100000021221), we get a palindrome (8321200021238).

The spelling of 1221200000017 in words is "one trillion, two hundred twenty-one billion, two hundred million, seventeen", and thus it is an aban number.