21130120515 has 64 divisors (see below), whose sum is σ = 38923822080. Its totient is φ = 9588257280.

The previous prime is 21130120489. The next prime is 21130120519. The reversal of 21130120515 is 51502103112.

It is not a de Polignac number, because 21130120515 - 2⁹ = 21130120003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21130120491 and 21130120500.

It is not an unprimeable number, because it can be changed into a prime (21130120519) 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 63 ways as a sum of consecutive naturals, for example, 11810241 + ... + 11812029.

It is an arithmetic number, because the mean of its divisors is an integer number (608184720).

Almost surely, 2^21130120515 is an apocalyptic number.

21130120515 is a deficient number, since it is larger than the sum of its proper divisors (17793701565).

21130120515 is a wasteful number, since it uses less digits than its factorization.

21130120515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 21130120515 its reverse (51502103112), we get a palindrome (72632223627).

The spelling of 21130120515 in words is "twenty-one billion, one hundred thirty million, one hundred twenty thousand, five hundred fifteen".