21004313210 has 8 divisors (see below), whose sum is σ = 37807763796. Its totient is φ = 8401725280.

The previous prime is 21004313177. The next prime is 21004313219. The reversal of 21004313210 is 1231340012.

It can be written as a sum of positive squares in 2 ways, for example, as 20965012849 + 39300361 = 144793^2 + 6269^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21004313219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050215651 + ... + 1050215670.

Almost surely, 2^21004313210 is an apocalyptic number.

21004313210 is a deficient number, since it is larger than the sum of its proper divisors (16803450586).

21004313210 is a wasteful number, since it uses less digits than its factorization.

21004313210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100431328.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21004313210 its reverse (1231340012), we get a palindrome (22235653222).

The spelling of 21004313210 in words is "twenty-one billion, four million, three hundred thirteen thousand, two hundred ten".