1212132131321 has 4 divisors (see below), whose sum is σ = 1223252609700. Its totient is φ = 1201011652944.

The previous prime is 1212132131317. The next prime is 1212132131339. The reversal of 1212132131321 is 1231312312121.

It is a happy number.

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 1040685619600 + 171446511721 = 1020140^2 + 414061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212132131321 - 2² = 1212132131317 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 (1212132131311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5560239026 + ... + 5560239243.

It is an arithmetic number, because the mean of its divisors is an integer number (305813152425).

Almost surely, 2^{1212132131321} is an apocalyptic number.

It is an amenable number.

1212132131321 is a deficient number, since it is larger than the sum of its proper divisors (11120478379).

1212132131321 is a wasteful number, since it uses less digits than its factorization.

1212132131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11120478378.

The product of its digits is 432, while the sum is 23.

Adding to 1212132131321 its reverse (1231312312121), we get a palindrome (2443444443442).

The spelling of 1212132131321 in words is "one trillion, two hundred twelve billion, one hundred thirty-two million, one hundred thirty-one thousand, three hundred twenty-one".