1200100012121 has 4 divisors (see below), whose sum is σ = 1200773092992. Its totient is φ = 1199426931252.

The previous prime is 1200100012109. The next prime is 1200100012169. The reversal of 1200100012121 is 1212100010021.

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 1200100012121 - 2²⁶ = 1200032903257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200100012921) 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, 336537761 + ... + 336541326.

It is an arithmetic number, because the mean of its divisors is an integer number (300193273248).

Almost surely, 2^{1200100012121} is an apocalyptic number.

It is an amenable number.

1200100012121 is a deficient number, since it is larger than the sum of its proper divisors (673080871).

1200100012121 is an equidigital number, since it uses as much as digits as its factorization.

1200100012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673080870.

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

Adding to 1200100012121 its reverse (1212100010021), we get a palindrome (2412200022142).

The spelling of 1200100012121 in words is "one trillion, two hundred billion, one hundred million, twelve thousand, one hundred twenty-one".