1213134145121 has 4 divisors (see below), whose sum is σ = 1214633693700. Its totient is φ = 1211634596544.

The previous prime is 1213134145073. The next prime is 1213134145123. The reversal of 1213134145121 is 1215414313121.

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 1159465936225 + 53668208896 = 1076785^2 + 231664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213134145121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213134145123) 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, 749773076 + ... + 749774693.

It is an arithmetic number, because the mean of its divisors is an integer number (303658423425).

Almost surely, 2^{1213134145121} is an apocalyptic number.

It is an amenable number.

1213134145121 is a deficient number, since it is larger than the sum of its proper divisors (1499548579).

1213134145121 is an equidigital number, since it uses as much as digits as its factorization.

1213134145121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499548578.

The product of its digits is 2880, while the sum is 29.

Adding to 1213134145121 its reverse (1215414313121), we get a palindrome (2428548458242).

The spelling of 1213134145121 in words is "one trillion, two hundred thirteen billion, one hundred thirty-four million, one hundred forty-five thousand, one hundred twenty-one".