20212121112 has 32 divisors (see below), whose sum is σ = 53189793600. Its totient is φ = 6382774944.

The previous prime is 20212121099. The next prime is 20212121113. The reversal of 20212121112 is 21112121202.

It is a super-2 number, since 2×20212121112² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20212121091 and 20212121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212121113) 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, 22161958 + ... + 22162869.

It is an arithmetic number, because the mean of its divisors is an integer number (1662181050).

Almost surely, 2^20212121112 is an apocalyptic number.

It is an amenable number.

20212121112 is an abundant number, since it is smaller than the sum of its proper divisors (32977672488).

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

20212121112 is a wasteful number, since it uses less digits than its factorization.

20212121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44324855 (or 44324851 counting only the distinct ones).

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

Adding to 20212121112 its reverse (21112121202), we get a palindrome (41324242314).

The spelling of 20212121112 in words is "twenty billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twelve".