20121021212 has 12 divisors (see below), whose sum is σ = 35275007880. Its totient is φ = 10042447536.

The previous prime is 20121021199. The next prime is 20121021233. The reversal of 20121021212 is 21212012102.

It is a super-2 number, since 2×20121021212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4513262 + ... + 4517717.

It is an arithmetic number, because the mean of its divisors is an integer number (2939583990).

Almost surely, 2^20121021212 is an apocalyptic number.

It is an amenable number.

20121021212 is a deficient number, since it is larger than the sum of its proper divisors (15153986668).

20121021212 is a wasteful number, since it uses less digits than its factorization.

20121021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9031540 (or 9031538 counting only the distinct ones).

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

Adding to 20121021212 its reverse (21212012102), we get a palindrome (41333033314).

The spelling of 20121021212 in words is "twenty billion, one hundred twenty-one million, twenty-one thousand, two hundred twelve".