21320020130 has 16 divisors (see below), whose sum is σ = 38417009400. Its totient is φ = 8518902912.

The previous prime is 21320020129. The next prime is 21320020133. The reversal of 21320020130 is 3102002312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5153660521 + 16166359609 = 71789^2 + 127147^2 .

It is not an unprimeable number, because it can be changed into a prime (21320020133) 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 7 ways as a sum of consecutive naturals, for example, 1128305 + ... + 1147044.

Almost surely, 2^21320020130 is an apocalyptic number.

21320020130 is a deficient number, since it is larger than the sum of its proper divisors (17096989270).

21320020130 is a wasteful number, since it uses less digits than its factorization.

21320020130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276293.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21320020130 its reverse (3102002312), we get a palindrome (24422022442).

The spelling of 21320020130 in words is "twenty-one billion, three hundred twenty million, twenty thousand, one hundred thirty".