21003424130 has 32 divisors (see below), whose sum is σ = 41074662384. Its totient is φ = 7686475776.

The previous prime is 21003424103. The next prime is 21003424133. The reversal of 21003424130 is 3142430012.

It can be written as a sum of positive squares in 8 ways, for example, as 1970738449 + 19032685681 = 44393^2 + 137959^2 .

It is a super-2 number, since 2×21003424130² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003424133) 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, 700199 + ... + 729578.

Almost surely, 2^21003424130 is an apocalyptic number.

21003424130 is a deficient number, since it is larger than the sum of its proper divisors (20071238254).

21003424130 is a wasteful number, since it uses less digits than its factorization.

21003424130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429910.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21003424130 its reverse (3142430012), we get a palindrome (24145854142).

The spelling of 21003424130 in words is "twenty-one billion, three million, four hundred twenty-four thousand, one hundred thirty".