123435205212 has 96 divisors (see below), whose sum is σ = 330865920000. Its totient is φ = 35421969600.

The previous prime is 123435205189. The next prime is 123435205247. The reversal of 123435205212 is 212502534321.

It is a self number, because there is not a number n which added to its sum of digits gives 123435205212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7513287 + ... + 7529697.

It is an arithmetic number, because the mean of its divisors is an integer number (3446520000).

Almost surely, 2^123435205212 is an apocalyptic number.

123435205212 is a gapful number since it is divisible by the number (12) 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 123435205212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165432960000).

123435205212 is an abundant number, since it is smaller than the sum of its proper divisors (207430714788).

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

123435205212 is a wasteful number, since it uses less digits than its factorization.

123435205212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19447 (or 19445 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 123435205212 its reverse (212502534321), we get a palindrome (335937739533).

The spelling of 123435205212 in words is "one hundred twenty-three billion, four hundred thirty-five million, two hundred five thousand, two hundred twelve".