1200221121017 has 2 divisors, whose sum is σ = 1200221121018. Its totient is φ = 1200221121016.

The previous prime is 1200221120983. The next prime is 1200221121019. The reversal of 1200221121017 is 7101211220021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1178134405561 + 22086715456 = 1085419^2 + 148616^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200221121017 - 2²⁶ = 1200154012153 is a prime.

It is a super-2 number, since 2×1200221121017² (a number of 25 digits) contains 22 as substring.

Together with 1200221121019, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200221121017.

It is not a weakly prime, because it can be changed into another prime (1200221121019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600110560508 + 600110560509.

It is an arithmetic number, because the mean of its divisors is an integer number (600110560509).

Almost surely, 2^{1200221121017} is an apocalyptic number.

It is an amenable number.

1200221121017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200221121017 is an equidigital number, since it uses as much as digits as its factorization.

1200221121017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 1200221121017 its reverse (7101211220021), we get a palindrome (8301432341038).

The spelling of 1200221121017 in words is "one trillion, two hundred billion, two hundred twenty-one million, one hundred twenty-one thousand, seventeen".