21212101220212 has 48 divisors (see below), whose sum is σ = 44875154080512. Its totient is φ = 8576525548800.

The previous prime is 21212101220203. The next prime is 21212101220267. The reversal of 21212101220212 is 21202210121212.

It is a super-3 number, since 3×21212101220212³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21212101220212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225556039 + ... + 225650062.

It is an arithmetic number, because the mean of its divisors is an integer number (934899043344).

Almost surely, 2^{21212101220212} is an apocalyptic number.

It is an amenable number.

21212101220212 is an abundant number, since it is smaller than the sum of its proper divisors (23663052860300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212101220212 is a wasteful number, since it uses less digits than its factorization.

21212101220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451206208 (or 451206206 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21212101220212 its reverse (21202210121212), we get a palindrome (42414311341424).

The spelling of 21212101220212 in words is "twenty-one trillion, two hundred twelve billion, one hundred one million, two hundred twenty thousand, two hundred twelve".