21031302130 has 16 divisors (see below), whose sum is σ = 37866944664. Its totient is φ = 8410165120.

The previous prime is 21031302109. The next prime is 21031302161. The reversal of 21031302130 is 3120313012.

It can be written as a sum of positive squares in 4 ways, for example, as 16747206921 + 4284095209 = 129411^2 + 65453^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 256741 + ... + 328600.

Almost surely, 2^21031302130 is an apocalyptic number.

21031302130 is a deficient number, since it is larger than the sum of its proper divisors (16835642534).

21031302130 is a wasteful number, since it uses less digits than its factorization.

21031302130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588941.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21031302130 its reverse (3120313012), we get a palindrome (24151615142).

The spelling of 21031302130 in words is "twenty-one billion, thirty-one million, three hundred two thousand, one hundred thirty".