1200012100121 has 4 divisors (see below), whose sum is σ = 1225544272512. Its totient is φ = 1174479927732.

The previous prime is 1200012100109. The next prime is 1200012100247. The reversal of 1200012100121 is 1210012100021.

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 1200012100121 - 2¹⁸ = 1200011837977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1200012106121) 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, 12766086125 + ... + 12766086218.

It is an arithmetic number, because the mean of its divisors is an integer number (306386068128).

Almost surely, 2^{1200012100121} is an apocalyptic number.

It is an amenable number.

1200012100121 is a deficient number, since it is larger than the sum of its proper divisors (25532172391).

1200012100121 is an equidigital number, since it uses as much as digits as its factorization.

1200012100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25532172390.

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

Adding to 1200012100121 its reverse (1210012100021), we get a palindrome (2410024200142).

The spelling of 1200012100121 in words is "one trillion, two hundred billion, twelve million, one hundred thousand, one hundred twenty-one".