1221041340013 has 16 divisors (see below), whose sum is σ = 1404269936640. Its totient is φ = 1051373948400.

The previous prime is 1221041339993. The next prime is 1221041340017. The reversal of 1221041340013 is 3100431401221.

It is a cyclic number.

It is not a de Polignac number, because 1221041340013 - 2³³ = 1212451405421 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 (1221041340017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38077233 + ... + 38109286.

It is an arithmetic number, because the mean of its divisors is an integer number (87766871040).

Almost surely, 2^{1221041340013} is an apocalyptic number.

It is an amenable number.

1221041340013 is a deficient number, since it is larger than the sum of its proper divisors (183228596627).

1221041340013 is a wasteful number, since it uses less digits than its factorization.

1221041340013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76186608.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1221041340013 its reverse (3100431401221), we get a palindrome (4321472741234).

The spelling of 1221041340013 in words is "one trillion, two hundred twenty-one billion, forty-one million, three hundred forty thousand, thirteen".