221000975232 has 128 divisors (see below), whose sum is σ = 595854558720. Its totient is φ = 72562022400.

The previous prime is 221000975179. The next prime is 221000975233. The reversal of 221000975232 is 232579000122.

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 = 221000975193 and 221000975202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000975233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35521882 + ... + 35528102.

It is an arithmetic number, because the mean of its divisors is an integer number (4655113740).

Almost surely, 2^221000975232 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 221000975232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297927279360).

221000975232 is an abundant number, since it is smaller than the sum of its proper divisors (374853583488).

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

221000975232 is a wasteful number, since it uses less digits than its factorization.

221000975232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7612 (or 7600 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

Adding to 221000975232 its reverse (232579000122), we get a palindrome (453579975354).

The spelling of 221000975232 in words is "two hundred twenty-one billion, nine hundred seventy-five thousand, two hundred thirty-two".