20123213112 has 96 divisors (see below), whose sum is σ = 54943668000. Its totient is φ = 6653318400.

The previous prime is 20123213111. The next prime is 20123213189. The reversal of 20123213112 is 21131232102.

20123213112 is a `hidden beast` number, since 20 + 12 + 321 + 311 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123213111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12056214 + ... + 12057882.

It is an arithmetic number, because the mean of its divisors is an integer number (572329875).

Almost surely, 2^20123213112 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 20123213112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27471834000).

20123213112 is an abundant number, since it is smaller than the sum of its proper divisors (34820454888).

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

20123213112 is a wasteful number, since it uses less digits than its factorization.

20123213112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2941 (or 2934 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20123213112 its reverse (21131232102), we get a palindrome (41254445214).

The spelling of 20123213112 in words is "twenty billion, one hundred twenty-three million, two hundred thirteen thousand, one hundred twelve".