32001231220 has 96 divisors (see below), whose sum is σ = 78777474048. Its totient is φ = 10691807232.

The previous prime is 32001231187. The next prime is 32001231221. The reversal of 32001231220 is 2213210023.

It is a junction number, because it is equal to n+sod(n) for n = 32001231194 and 32001231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32001231221) 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, 1522704 + ... + 1543576.

It is an arithmetic number, because the mean of its divisors is an integer number (820598688).

Almost surely, 2^32001231220 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 32001231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39388737024).

32001231220 is an abundant number, since it is smaller than the sum of its proper divisors (46776242828).

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

32001231220 is a wasteful number, since it uses less digits than its factorization.

32001231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21169 (or 21167 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 32001231220 its reverse (2213210023), we get a palindrome (34214441243).

The spelling of 32001231220 in words is "thirty-two billion, one million, two hundred thirty-one thousand, two hundred twenty".