20212121220212 has 24 divisors (see below), whose sum is σ = 35716497712896. Its totient is φ = 10007417894688.

The previous prime is 20212121220157. The next prime is 20212121220217. The reversal of 20212121220212 is 21202212121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212121220217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6624698 + ... + 9182094.

It is an arithmetic number, because the mean of its divisors is an integer number (1488187404704).

Almost surely, 2^{20212121220212} is an apocalyptic number.

It is an amenable number.

20212121220212 is a deficient number, since it is larger than the sum of its proper divisors (15504376492684).

20212121220212 is a wasteful number, since it uses less digits than its factorization.

20212121220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576687 (or 2576685 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20212121220212 its reverse (21202212121202), we get a palindrome (41414333341414).

The spelling of 20212121220212 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty thousand, two hundred twelve".