1200123310011 has 4 divisors (see below), whose sum is σ = 1600164413352. Its totient is φ = 800082206672.

The previous prime is 1200123309967. The next prime is 1200123310037. The reversal of 1200123310011 is 1100133210021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1200123310011 - 2⁶ = 1200123309947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200123310051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200020551666 + ... + 200020551671.

It is an arithmetic number, because the mean of its divisors is an integer number (400041103338).

Almost surely, 2^{1200123310011} is an apocalyptic number.

1200123310011 is a deficient number, since it is larger than the sum of its proper divisors (400041103341).

1200123310011 is an equidigital number, since it uses as much as digits as its factorization.

1200123310011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400041103340.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1200123310011 its reverse (1100133210021), we get a palindrome (2300256520032).

The spelling of 1200123310011 in words is "one trillion, two hundred billion, one hundred twenty-three million, three hundred ten thousand, eleven".