20211212112 has 320 divisors, whose sum is σ = 66875719680. Its totient is φ = 5117478912.

The previous prime is 20211212101. The next prime is 20211212123. The reversal of 20211212112 is 21121211202.

It is an interprime number because it is at equal distance from previous prime (20211212101) and next prime (20211212123).

It is a junction number, because it is equal to n+sod(n) for n = 20211212091 and 20211212100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12766873 + ... + 12768455.

It is an arithmetic number, because the mean of its divisors is an integer number (208986624).

Almost surely, 2^20211212112 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 20211212112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33437859840).

20211212112 is an abundant number, since it is smaller than the sum of its proper divisors (46664507568).

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

20211212112 is a wasteful number, since it uses less digits than its factorization.

20211212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730 (or 1724 counting only the distinct ones).

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

Adding to 20211212112 its reverse (21121211202), we get a palindrome (41332423314).

The spelling of 20211212112 in words is "twenty billion, two hundred eleven million, two hundred twelve thousand, one hundred twelve".