123212232220 has 96 divisors (see below), whose sum is σ = 322705990656. Its totient is φ = 38390246400.

The previous prime is 123212232193. The next prime is 123212232229. The reversal of 123212232220 is 22232212321.

123212232220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×123212232220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 123212232191 and 123212232200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123212232229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4901604 + ... + 4926676.

It is an arithmetic number, because the mean of its divisors is an integer number (3361520736).

Almost surely, 2^123212232220 is an apocalyptic number.

123212232220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123212232220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161352995328).

123212232220 is an abundant number, since it is smaller than the sum of its proper divisors (199493758436).

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

123212232220 is a wasteful number, since it uses less digits than its factorization.

123212232220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28291 (or 28289 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 123212232220 its reverse (22232212321), we get a palindrome (145444444541).

The spelling of 123212232220 in words is "one hundred twenty-three billion, two hundred twelve million, two hundred thirty-two thousand, two hundred twenty".