221331220032 has 56 divisors (see below), whose sum is σ = 630652105216. Its totient is φ = 68101913088.

The previous prime is 221331220021. The next prime is 221331220037. The reversal of 221331220032 is 230022133122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221331219990 and 221331220008.

It is not an unprimeable number, because it can be changed into a prime (221331220037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44334688 + ... + 44339679.

It is an arithmetic number, because the mean of its divisors is an integer number (11261644736).

Almost surely, 2^221331220032 is an apocalyptic number.

It is an amenable number.

221331220032 is an abundant number, since it is smaller than the sum of its proper divisors (409320885184).

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

221331220032 is a wasteful number, since it uses less digits than its factorization.

221331220032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88674395 (or 88674385 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 221331220032 its reverse (230022133122), we get a palindrome (451353353154).

The spelling of 221331220032 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred twenty thousand, thirty-two".