15642421013 has 2 divisors, whose sum is σ = 15642421014. Its totient is φ = 15642421012.

The previous prime is 15642420979. The next prime is 15642421031. The reversal of 15642421013 is 31012424651.

15642421013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (15642421031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7989320689 + 7653100324 = 89383^2 + 87482^2 .

It is a cyclic number.

It is not a de Polignac number, because 15642421013 - 2²⁴ = 15625643797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15642421063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7821210506 + 7821210507.

It is an arithmetic number, because the mean of its divisors is an integer number (7821210507).

Almost surely, 2^15642421013 is an apocalyptic number.

It is an amenable number.

15642421013 is a deficient number, since it is larger than the sum of its proper divisors (1).

15642421013 is an equidigital number, since it uses as much as digits as its factorization.

15642421013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 15642421013 its reverse (31012424651), we get a palindrome (46654845664).

The spelling of 15642421013 in words is "fifteen billion, six hundred forty-two million, four hundred twenty-one thousand, thirteen".