21212101310 has 8 divisors (see below), whose sum is σ = 38181782376. Its totient is φ = 8484840520.

The previous prime is 21212101289. The next prime is 21212101321. The reversal of 21212101310 is 1310121212.

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

It is a super-3 number, since 3×21212101310³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060605056 + ... + 1060605075.

It is an arithmetic number, because the mean of its divisors is an integer number (4772722797).

Almost surely, 2^21212101310 is an apocalyptic number.

21212101310 is a deficient number, since it is larger than the sum of its proper divisors (16969681066).

21212101310 is a wasteful number, since it uses less digits than its factorization.

21212101310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121210138.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21212101310 its reverse (1310121212), we get a palindrome (22522222522).

The spelling of 21212101310 in words is "twenty-one billion, two hundred twelve million, one hundred one thousand, three hundred ten".