1211123079121 has 4 divisors (see below), whose sum is σ = 1211744488500. Its totient is φ = 1210501669744.

The previous prime is 1211123079119. The next prime is 1211123079143. The reversal of 1211123079121 is 1219703211121.

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 530473328896 + 680649750225 = 728336^2 + 825015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211123079121 - 2¹ = 1211123079119 is a prime.

It is a super-2 number, since 2×1211123079121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211123077121) 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, 310701766 + ... + 310705663.

It is an arithmetic number, because the mean of its divisors is an integer number (302936122125).

Almost surely, 2^{1211123079121} is an apocalyptic number.

It is an amenable number.

1211123079121 is a deficient number, since it is larger than the sum of its proper divisors (621409379).

1211123079121 is an equidigital number, since it uses as much as digits as its factorization.

1211123079121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621409378.

The product of its (nonzero) digits is 1512, while the sum is 31.

The spelling of 1211123079121 in words is "one trillion, two hundred eleven billion, one hundred twenty-three million, seventy-nine thousand, one hundred twenty-one".