20011221212 has 12 divisors (see below), whose sum is σ = 35201087376. Its totient is φ = 9953767680.

The previous prime is 20011221193. The next prime is 20011221239. The reversal of 20011221212 is 21212211002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12959864 + ... + 12961407.

It is an arithmetic number, because the mean of its divisors is an integer number (2933423948).

Almost surely, 2^20011221212 is an apocalyptic number.

It is an amenable number.

20011221212 is a deficient number, since it is larger than the sum of its proper divisors (15189866164).

20011221212 is a wasteful number, since it uses less digits than its factorization.

20011221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25921468 (or 25921466 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20011221212 its reverse (21212211002), we get a palindrome (41223432214).

The spelling of 20011221212 in words is "twenty billion, eleven million, two hundred twenty-one thousand, two hundred twelve".