21212103012212 has 12 divisors (see below), whose sum is σ = 42424206024480. Its totient is φ = 9090901290936.

The previous prime is 21212103012197. The next prime is 21212103012229. The reversal of 21212103012212 is 21221030121212.

21212103012212 is an admirable number.

It is a super-3 number, since 3×21212103012212³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 378787553762 + ... + 378787553817.

It is an arithmetic number, because the mean of its divisors is an integer number (3535350502040).

Almost surely, 2^{21212103012212} is an apocalyptic number.

It is an amenable number.

21212103012212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21212103012212 is a wasteful number, since it uses less digits than its factorization.

21212103012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757575107590 (or 757575107588 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21212103012212 its reverse (21221030121212), we get a palindrome (42433133133424).

The spelling of 21212103012212 in words is "twenty-one trillion, two hundred twelve billion, one hundred three million, twelve thousand, two hundred twelve".