1200121221113 has 4 divisors (see below), whose sum is σ = 1200139218768. Its totient is φ = 1200103223460.

The previous prime is 1200121221109. The next prime is 1200121221137. The reversal of 1200121221113 is 3111221210021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1200121221113 - 2² = 1200121221109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200121221091 and 1200121221100.

It is not an unprimeable number, because it can be changed into a prime (1200121221193) 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, 8898431 + ... + 9032292.

It is an arithmetic number, because the mean of its divisors is an integer number (300034804692).

Almost surely, 2^{1200121221113} is an apocalyptic number.

It is an amenable number.

1200121221113 is a deficient number, since it is larger than the sum of its proper divisors (17997655).

1200121221113 is an equidigital number, since it uses as much as digits as its factorization.

1200121221113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17997654.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1200121221113 its reverse (3111221210021), we get a palindrome (4311342431134).

The spelling of 1200121221113 in words is "one trillion, two hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred thirteen".