21212101102210 has 16 divisors (see below), whose sum is σ = 38181847032000. Its totient is φ = 8484825985776.

The previous prime is 21212101102163. The next prime is 21212101102223. The reversal of 21212101102210 is 1220110121212.

It is a super-3 number, since 3×21212101102210³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5936641 + ... + 8812939.

It is an arithmetic number, because the mean of its divisors is an integer number (2386365439500).

Almost surely, 2^{21212101102210} is an apocalyptic number.

21212101102210 is a deficient number, since it is larger than the sum of its proper divisors (16969745929790).

21212101102210 is a wasteful number, since it uses less digits than its factorization.

21212101102210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3613785.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21212101102210 its reverse (1220110121212), we get a palindrome (22432211223422).

The spelling of 21212101102210 in words is "twenty-one trillion, two hundred twelve billion, one hundred one million, one hundred two thousand, two hundred ten".