21170452130 has 8 divisors (see below), whose sum is σ = 38106813852. Its totient is φ = 8468180848.

The previous prime is 21170452117. The next prime is 21170452159. The reversal of 21170452130 is 3125407112.

It can be written as a sum of positive squares in 2 ways, for example, as 20696562769 + 473889361 = 143863^2 + 21769^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21170452130.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1058522597 + ... + 1058522616.

Almost surely, 2^21170452130 is an apocalyptic number.

21170452130 is a deficient number, since it is larger than the sum of its proper divisors (16936361722).

21170452130 is a wasteful number, since it uses less digits than its factorization.

21170452130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117045220.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 21170452130 its reverse (3125407112), we get a palindrome (24295859242).

The spelling of 21170452130 in words is "twenty-one billion, one hundred seventy million, four hundred fifty-two thousand, one hundred thirty".