1200112121 has 4 divisors (see below), whose sum is σ = 1292428452. Its totient is φ = 1107795792.

The previous prime is 1200112117. The next prime is 1200112139. The reversal of 1200112121 is 1212110021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1212110021 = 5683 ⋅213287.

It can be written as a sum of positive squares in 2 ways, for example, as 459673600 + 740438521 = 21440^2 + 27211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200112121 - 2² = 1200112117 is a prime.

It is a super-2 number, since 2×1200112121² = 2880538205942237282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200112141) 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, 46158146 + ... + 46158171.

It is an arithmetic number, because the mean of its divisors is an integer number (323107113).

Almost surely, 2^1200112121 is an apocalyptic number.

It is an amenable number.

1200112121 is a deficient number, since it is larger than the sum of its proper divisors (92316331).

1200112121 is an equidigital number, since it uses as much as digits as its factorization.

1200112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92316330.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1200112121 is about 34642.6344408158. The cubic root of 1200112121 is about 1062.6916643578.

Adding to 1200112121 its reverse (1212110021), we get a palindrome (2412222142).

The spelling of 1200112121 in words is "one billion, two hundred million, one hundred twelve thousand, one hundred twenty-one".