1200111221173 has 2 divisors, whose sum is σ = 1200111221174. Its totient is φ = 1200111221172.

The previous prime is 1200111221171. The next prime is 1200111221213. The reversal of 1200111221173 is 3711221110021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1163330502084 + 36780719089 = 1078578^2 + 191783^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200111221173 - 2¹ = 1200111221171 is a prime.

Together with 1200111221171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200111221171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600055610586 + 600055610587.

It is an arithmetic number, because the mean of its divisors is an integer number (600055610587).

Almost surely, 2^{1200111221173} is an apocalyptic number.

It is an amenable number.

1200111221173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200111221173 is an equidigital number, since it uses as much as digits as its factorization.

1200111221173 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 22.

Adding to 1200111221173 its reverse (3711221110021), we get a palindrome (4911332331194).

The spelling of 1200111221173 in words is "one trillion, two hundred billion, one hundred eleven million, two hundred twenty-one thousand, one hundred seventy-three".