1212031100121 has 4 divisors (see below), whose sum is σ = 1616041466832. Its totient is φ = 808020733412.

The previous prime is 1212031100083. The next prime is 1212031100123. The reversal of 1212031100121 is 1210011302121.

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 a de Polignac number, because none of the positive numbers 2^k-1212031100121 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212031100121.

It is not an unprimeable number, because it can be changed into a prime (1212031100123) 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, 202005183351 + ... + 202005183356.

It is an arithmetic number, because the mean of its divisors is an integer number (404010366708).

Almost surely, 2^{1212031100121} is an apocalyptic number.

It is an amenable number.

1212031100121 is a deficient number, since it is larger than the sum of its proper divisors (404010366711).

1212031100121 is an equidigital number, since it uses as much as digits as its factorization.

1212031100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404010366710.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1212031100121 its reverse (1210011302121), we get a palindrome (2422042402242).

The spelling of 1212031100121 in words is "one trillion, two hundred twelve billion, thirty-one million, one hundred thousand, one hundred twenty-one".