221121320432 has 80 divisors (see below), whose sum is σ = 461012627232. Its totient is φ = 102369484800.

The previous prime is 221121320423. The next prime is 221121320437. The reversal of 221121320432 is 234023121122.

It is a junction number, because it is equal to n+sod(n) for n = 221121320398 and 221121320407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121320437) 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, 7868807 + ... + 7896857.

Almost surely, 2^221121320432 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 221121320432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230506313616).

221121320432 is an abundant number, since it is smaller than the sum of its proper divisors (239891306800).

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

221121320432 is a wasteful number, since it uses less digits than its factorization.

221121320432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28546 (or 28540 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 221121320432 its reverse (234023121122), we get a palindrome (455144441554).

The spelling of 221121320432 in words is "two hundred twenty-one billion, one hundred twenty-one million, three hundred twenty thousand, four hundred thirty-two".