1200123322121 has 8 divisors (see below), whose sum is σ = 1205973339144. Its totient is φ = 1194282455040.

The previous prime is 1200123322109. The next prime is 1200123322127. The reversal of 1200123322121 is 1212233210021.

It can be written as a sum of positive squares in 4 ways, for example, as 888379766521 + 311743555600 = 942539^2 + 558340^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1200123322121 - 2¹⁴ = 1200123305737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200123322093 and 1200123322102.

It is not an unprimeable number, because it can be changed into a prime (1200123322127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2024450 + ... + 2549243.

It is an arithmetic number, because the mean of its divisors is an integer number (150746667393).

Almost surely, 2^{1200123322121} is an apocalyptic number.

It is an amenable number.

1200123322121 is a deficient number, since it is larger than the sum of its proper divisors (5850017023).

1200123322121 is a wasteful number, since it uses less digits than its factorization.

1200123322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4574971.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1200123322121 its reverse (1212233210021), we get a palindrome (2412356532142).

It can be divided in two parts, 1200 and 123322121, that added together give a palindrome (123323321).

The spelling of 1200123322121 in words is "one trillion, two hundred billion, one hundred twenty-three million, three hundred twenty-two thousand, one hundred twenty-one".