15642421003 has 16 divisors (see below), whose sum is σ = 17824790016. Its totient is φ = 13588051840.

The previous prime is 15642420979. The next prime is 15642421013. The reversal of 15642421003 is 30012424651.

15642421003 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15642421003 - 2¹⁷ = 15642289931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15642421013) 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 in 15 ways as a sum of consecutive naturals, for example, 217251 + ... + 280147.

It is an arithmetic number, because the mean of its divisors is an integer number (1114049376).

Almost surely, 2^15642421003 is an apocalyptic number.

15642421003 is a deficient number, since it is larger than the sum of its proper divisors (2182369013).

15642421003 is a wasteful number, since it uses less digits than its factorization.

15642421003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63914.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 15642421003 its reverse (30012424651), we get a palindrome (45654845654).

It can be divided in two parts, 15642 and 421003, that added together give a triangular number (436645 = T₉₃₄).

The spelling of 15642421003 in words is "fifteen billion, six hundred forty-two million, four hundred twenty-one thousand, three".