1212031011021 has 4 divisors (see below), whose sum is σ = 1616041348032. Its totient is φ = 808020674012.

The previous prime is 1212031011001. The next prime is 1212031011031. The reversal of 1212031011021 is 1201101302121.

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 not a de Polignac number, because 1212031011021 - 2⁵ = 1212031010989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212031011001) 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, 202005168501 + ... + 202005168506.

It is an arithmetic number, because the mean of its divisors is an integer number (404010337008).

Almost surely, 2^{1212031011021} is an apocalyptic number.

It is an amenable number.

1212031011021 is a deficient number, since it is larger than the sum of its proper divisors (404010337011).

1212031011021 is an equidigital number, since it uses as much as digits as its factorization.

1212031011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404010337010.

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

Adding to 1212031011021 its reverse (1201101302121), we get a palindrome (2413132313142).

The spelling of 1212031011021 in words is "one trillion, two hundred twelve billion, thirty-one million, eleven thousand, twenty-one".