1200121010123 has 16 divisors (see below), whose sum is σ = 1377037409280. Its totient is φ = 1024578244800.

The previous prime is 1200121010113. The next prime is 1200121010147. The reversal of 1200121010123 is 3210101210021.

It is a cyclic number.

It is not a de Polignac number, because 1200121010123 - 2¹⁴ = 1200120993739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200121010098 and 1200121010107.

It is not an unprimeable number, because it can be changed into a prime (1200121010113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2158103 + ... + 2656623.

It is an arithmetic number, because the mean of its divisors is an integer number (86064838080).

Almost surely, 2^{1200121010123} is an apocalyptic number.

1200121010123 is a deficient number, since it is larger than the sum of its proper divisors (176916399157).

1200121010123 is a wasteful number, since it uses less digits than its factorization.

1200121010123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499898.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1200121010123 its reverse (3210101210021), we get a palindrome (4410222220144).

The spelling of 1200121010123 in words is "one trillion, two hundred billion, one hundred twenty-one million, ten thousand, one hundred twenty-three".