20212121212 has 12 divisors (see below), whose sum is σ = 35721422856. Its totient is φ = 10006000400.

The previous prime is 20212121201. The next prime is 20212121227. The reversal of 20212121212 is 21212121202.

It is a happy number.

20212121212 is a modest number, since divided by 121212 gives 20212 as remainder.

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, 25014598 + ... + 25015405.

It is an arithmetic number, because the mean of its divisors is an integer number (2976785238).

Almost surely, 2^20212121212 is an apocalyptic number.

It is an amenable number.

20212121212 is a deficient number, since it is larger than the sum of its proper divisors (15509301644).

20212121212 is a wasteful number, since it uses less digits than its factorization.

20212121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50030108 (or 50030106 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20212121212 its reverse (21212121202), we get a palindrome (41424242414).

The spelling of 20212121212 in words is "twenty billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twelve".