21210233210 has 16 divisors (see below), whose sum is σ = 38180080296. Its totient is φ = 8483724288.

The previous prime is 21210233189. The next prime is 21210233279. The reversal of 21210233210 is 1233201212.

It can be written as a sum of positive squares in 4 ways, for example, as 8093341369 + 13116891841 = 89963^2 + 114529^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 411434 + ... + 460106.

Almost surely, 2^21210233210 is an apocalyptic number.

21210233210 is a deficient number, since it is larger than the sum of its proper divisors (16969847086).

21210233210 is a wasteful number, since it uses less digits than its factorization.

21210233210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92257.

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

Adding to 21210233210 its reverse (1233201212), we get a palindrome (22443434422).

The spelling of 21210233210 in words is "twenty-one billion, two hundred ten million, two hundred thirty-three thousand, two hundred ten".