20121020212 has 12 divisors (see below), whose sum is σ = 35213697316. Its totient is φ = 10059963840.

The previous prime is 20121020173. The next prime is 20121020237. The reversal of 20121020212 is 21202012102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6297374736 + 13823645476 = 79356^2 + 117574^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20121020192 and 20121020201.

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, 47193 + ... + 206080.

Almost surely, 2^20121020212 is an apocalyptic number.

It is an amenable number.

20121020212 is a deficient number, since it is larger than the sum of its proper divisors (15092677104).

20121020212 is a wasteful number, since it uses less digits than its factorization.

20121020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273138 (or 273136 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20121020212 its reverse (21202012102), we get a palindrome (41323032314).

The spelling of 20121020212 in words is "twenty billion, one hundred twenty-one million, twenty thousand, two hundred twelve".