1242220204013 has 4 divisors (see below), whose sum is σ = 1244914825308. Its totient is φ = 1239525582720.

The previous prime is 1242220204009. The next prime is 1242220204039. The reversal of 1242220204013 is 3104020222421.

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 340656660964 + 901563543049 = 583658^2 + 949507^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242220204013 - 2² = 1242220204009 is a prime.

It is a super-2 number, since 2×1242220204013² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242220204013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242220204213) 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, 1347309956 + ... + 1347310877.

It is an arithmetic number, because the mean of its divisors is an integer number (311228706327).

Almost surely, 2^{1242220204013} is an apocalyptic number.

It is an amenable number.

1242220204013 is a deficient number, since it is larger than the sum of its proper divisors (2694621295).

1242220204013 is an equidigital number, since it uses as much as digits as its factorization.

1242220204013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694621294.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 1242220204013 its reverse (3104020222421), we get a palindrome (4346240426434).

The spelling of 1242220204013 in words is "one trillion, two hundred forty-two billion, two hundred twenty million, two hundred four thousand, thirteen".