221021231232 has 128 divisors (see below), whose sum is σ = 625796928000. Its totient is φ = 68874321920.

The previous prime is 221021231203. The next prime is 221021231261. The reversal of 221021231232 is 232132120122.

It is an interprime number because it is at equal distance from previous prime (221021231203) and next prime (221021231261).

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 221021231199 and 221021231208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 859057 + ... + 1086287.

It is an arithmetic number, because the mean of its divisors is an integer number (4889038500).

Almost surely, 2^221021231232 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 221021231232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312898464000).

221021231232 is an abundant number, since it is smaller than the sum of its proper divisors (404775696768).

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

221021231232 is a wasteful number, since it uses less digits than its factorization.

221021231232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227414 (or 227402 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221021231232 its reverse (232132120122), we get a palindrome (453153351354).

The spelling of 221021231232 in words is "two hundred twenty-one billion, twenty-one million, two hundred thirty-one thousand, two hundred thirty-two".