20121223232 has 112 divisors (see below), whose sum is σ = 45018984384. Its totient is φ = 8843520000.

The previous prime is 20121223229. The next prime is 20121223247. The reversal of 20121223232 is 23232212102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3054182 + ... + 3060762.

Almost surely, 2^20121223232 is an apocalyptic number.

20121223232 is a gapful number since it is divisible by the number (22) 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 20121223232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22509492192).

20121223232 is an abundant number, since it is smaller than the sum of its proper divisors (24897761152).

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

20121223232 is a wasteful number, since it uses less digits than its factorization.

20121223232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6748 (or 6738 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20121223232 its reverse (23232212102), we get a palindrome (43353435334).

The spelling of 20121223232 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-three thousand, two hundred thirty-two".