21115005130 has 16 divisors (see below), whose sum is σ = 38018027880. Its totient is φ = 8443553472.

The previous prime is 21115005113. The next prime is 21115005143. The reversal of 21115005130 is 3150051112.

It can be written as a sum of positive squares in 4 ways, for example, as 8825287249 + 12289717881 = 93943^2 + 110859^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21115005098 and 21115005107.

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, 269649 + ... + 339028.

Almost surely, 2^21115005130 is an apocalyptic number.

21115005130 is a deficient number, since it is larger than the sum of its proper divisors (16903022750).

21115005130 is a wasteful number, since it uses less digits than its factorization.

21115005130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612153.

The product of its (nonzero) digits is 150, while the sum is 19.

Adding to 21115005130 its reverse (3150051112), we get a palindrome (24265056242).

The spelling of 21115005130 in words is "twenty-one billion, one hundred fifteen million, five thousand, one hundred thirty".