21212323330210 has 8 divisors (see below), whose sum is σ = 38182181994396. Its totient is φ = 8484929332080.

The previous prime is 21212323330189. The next prime is 21212323330267. The reversal of 21212323330210 is 1203332321212.

It can be written as a sum of positive squares in 2 ways, for example, as 20444984121769 + 767339208441 = 4521613^2 + 875979^2 .

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

It is a super-2 number, since 2×21212323330210² (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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060616166501 + ... + 1060616166520.

Almost surely, 2^{21212323330210} is an apocalyptic number.

21212323330210 is a deficient number, since it is larger than the sum of its proper divisors (16969858664186).

21212323330210 is a wasteful number, since it uses less digits than its factorization.

21212323330210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121232333028.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21212323330210 its reverse (1203332321212), we get a palindrome (22415655651422).

The spelling of 21212323330210 in words is "twenty-one trillion, two hundred twelve billion, three hundred twenty-three million, three hundred thirty thousand, two hundred ten".