1200121111873 has 2 divisors, whose sum is σ = 1200121111874. Its totient is φ = 1200121111872.

The previous prime is 1200121111859. The next prime is 1200121111897. The reversal of 1200121111873 is 3781111210021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 791375705649 + 408745406224 = 889593^2 + 639332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200121111873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200121111373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600060555936 + 600060555937.

It is an arithmetic number, because the mean of its divisors is an integer number (600060555937).

Almost surely, 2^{1200121111873} is an apocalyptic number.

It is an amenable number.

1200121111873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200121111873 is an equidigital number, since it uses as much as digits as its factorization.

1200121111873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 28.

Adding to 1200121111873 its reverse (3781111210021), we get a palindrome (4981232321894).

The spelling of 1200121111873 in words is "one trillion, two hundred billion, one hundred twenty-one million, one hundred eleven thousand, eight hundred seventy-three".