20202121212 has 144 divisors (see below), whose sum is σ = 60649212960. Its totient is φ = 5183958528.

The previous prime is 20202121169. The next prime is 20202121217. The reversal of 20202121212 is 21212120202.

It is a junction number, because it is equal to n+sod(n) for n = 20202121191 and 20202121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202121217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 247114 + ... + 318542.

It is an arithmetic number, because the mean of its divisors is an integer number (421175090).

Almost surely, 2^20202121212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20202121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30324606480).

20202121212 is an abundant number, since it is smaller than the sum of its proper divisors (40447091748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20202121212 is a wasteful number, since it uses less digits than its factorization.

20202121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71500 (or 71491 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20202121212 its reverse (21212120202), we get a palindrome (41414241414).

The spelling of 20202121212 in words is "twenty billion, two hundred two million, one hundred twenty-one thousand, two hundred twelve".