1200121221193 has 2 divisors, whose sum is σ = 1200121221194. Its totient is φ = 1200121221192.

The previous prime is 1200121221191. The next prime is 1200121221199. The reversal of 1200121221193 is 3911221210021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 807027332409 + 393093888784 = 898347^2 + 626972^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200121221193 - 2¹ = 1200121221191 is a prime.

Together with 1200121221191, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1200121221191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600060610596 + 600060610597.

It is an arithmetic number, because the mean of its divisors is an integer number (600060610597).

Almost surely, 2^{1200121221193} is an apocalyptic number.

It is an amenable number.

1200121221193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200121221193 is an equidigital number, since it uses as much as digits as its factorization.

1200121221193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 1200121221193 in words is "one trillion, two hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred ninety-three".