20112121212 has 24 divisors (see below), whose sum is σ = 46944562896. Its totient is φ = 6701714688.

The previous prime is 20112121189. The next prime is 20112121229. The reversal of 20112121212 is 21212121102.

20112121212 is a modest number, since divided by 121212 gives 20112 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20112121191 and 20112121200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254503 + ... + 324030.

It is an arithmetic number, because the mean of its divisors is an integer number (1956023454).

Almost surely, 2^20112121212 is an apocalyptic number.

It is an amenable number.

20112121212 is an abundant number, since it is smaller than the sum of its proper divisors (26832441684).

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

20112121212 is a wasteful number, since it uses less digits than its factorization.

20112121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581437 (or 581435 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20112121212 its reverse (21212121102), we get a palindrome (41324242314).

The spelling of 20112121212 in words is "twenty billion, one hundred twelve million, one hundred twenty-one thousand, two hundred twelve".