21210012130 has 8 divisors (see below), whose sum is σ = 38178021852. Its totient is φ = 8484004848.

The previous prime is 21210012079. The next prime is 21210012169. The reversal of 21210012130 is 3121001212.

21210012130 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 20836633801 + 373378329 = 144349^2 + 19323^2 .

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

It is a super-2 number, since 2×21210012130² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21210012130.

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 3 ways as a sum of consecutive naturals, for example, 1060500597 + ... + 1060500616.

Almost surely, 2^21210012130 is an apocalyptic number.

21210012130 is a deficient number, since it is larger than the sum of its proper divisors (16968009722).

21210012130 is a wasteful number, since it uses less digits than its factorization.

21210012130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121001220.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21210012130 its reverse (3121001212), we get a palindrome (24331013342).

The spelling of 21210012130 in words is "twenty-one billion, two hundred ten million, twelve thousand, one hundred thirty".