221131043432 has 64 divisors (see below), whose sum is σ = 450613035600. Its totient is φ = 101127813120.

The previous prime is 221131043407. The next prime is 221131043443. The reversal of 221131043432 is 234340131122.

It can be written as a sum of positive squares in 8 ways, for example, as 6211646596 + 214919396836 = 78814^2 + 463594^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5193044 + ... + 5235452.

Almost surely, 2^221131043432 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 221131043432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225306517800).

221131043432 is an abundant number, since it is smaller than the sum of its proper divisors (229481992168).

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

221131043432 is a wasteful number, since it uses less digits than its factorization.

221131043432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42886 (or 42882 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 221131043432 its reverse (234340131122), we get a palindrome (455471174554).

The spelling of 221131043432 in words is "two hundred twenty-one billion, one hundred thirty-one million, forty-three thousand, four hundred thirty-two".