1200111202121 has 4 divisors (see below), whose sum is σ = 1292427448452. Its totient is φ = 1107794955792.

The previous prime is 1200111202079. The next prime is 1200111202123. The reversal of 1200111202121 is 1212021110021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 518636186896 + 681475015225 = 720164^2 + 825515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200111202121 - 2⁶ = 1200111202057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200111202096 and 1200111202105.

It is not an unprimeable number, because it can be changed into a prime (1200111202123) 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, 46158123146 + ... + 46158123171.

It is an arithmetic number, because the mean of its divisors is an integer number (323106862113).

Almost surely, 2^{1200111202121} is an apocalyptic number.

It is an amenable number.

1200111202121 is a deficient number, since it is larger than the sum of its proper divisors (92316246331).

1200111202121 is an equidigital number, since it uses as much as digits as its factorization.

1200111202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92316246330.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1200111202121 its reverse (1212021110021), we get a palindrome (2412132312142).

The spelling of 1200111202121 in words is "one trillion, two hundred billion, one hundred eleven million, two hundred two thousand, one hundred twenty-one".