21210232210210 has 48 divisors (see below), whose sum is σ = 39569244634296. Its totient is φ = 8182929936896.

The previous prime is 21210232210187. The next prime is 21210232210241. The reversal of 21210232210210 is 1201223201212.

It can be written as a sum of positive squares in 4 ways, for example, as 20356239980521 + 853992229689 = 4511789^2 + 924117^2 .

It is a super-2 number, since 2×21210232210210² (a number of 27 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 3903319 + ... + 7593178.

Almost surely, 2^{21210232210210} is an apocalyptic number.

21210232210210 is a deficient number, since it is larger than the sum of its proper divisors (18359012424086).

21210232210210 is a wasteful number, since it uses less digits than its factorization.

21210232210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11496675 (or 11496616 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21210232210210 its reverse (1201223201212), we get a palindrome (22411455411422).

The spelling of 21210232210210 in words is "twenty-one trillion, two hundred ten billion, two hundred thirty-two million, two hundred ten thousand, two hundred ten".