1213103410021 has 4 divisors (see below), whose sum is σ = 1213108040844. Its totient is φ = 1213098779200.

The previous prime is 1213103410019. The next prime is 1213103410027. The reversal of 1213103410021 is 1200143013121.

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 1077008084100 + 136095325921 = 1037790^2 + 368911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213103410021 - 2¹ = 1213103410019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213103410027) 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, 1897300 + ... + 2454781.

It is an arithmetic number, because the mean of its divisors is an integer number (303277010211).

Almost surely, 2^{1213103410021} is an apocalyptic number.

It is an amenable number.

1213103410021 is a deficient number, since it is larger than the sum of its proper divisors (4630823).

1213103410021 is an equidigital number, since it uses as much as digits as its factorization.

1213103410021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630822.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1213103410021 its reverse (1200143013121), we get a palindrome (2413246423142).

The spelling of 1213103410021 in words is "one trillion, two hundred thirteen billion, one hundred three million, four hundred ten thousand, twenty-one".