221232400443 has 48 divisors (see below), whose sum is σ = 337240213856. Its totient is φ = 144892074240.

The previous prime is 221232400409. The next prime is 221232400451. The reversal of 221232400443 is 344004232122.

221232400443 is a `hidden beast` number, since 2 + 21 + 232 + 400 + 4 + 4 + 3 = 666.

It is not a de Polignac number, because 221232400443 - 2¹⁶ = 221232334907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (221232408443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12635271 + ... + 12652767.

Almost surely, 2^221232400443 is an apocalyptic number.

221232400443 is a deficient number, since it is larger than the sum of its proper divisors (116007813413).

221232400443 is an equidigital number, since it uses as much as digits as its factorization.

221232400443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18426 (or 18414 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 221232400443 its reverse (344004232122), we get a palindrome (565236632565).

The spelling of 221232400443 in words is "two hundred twenty-one billion, two hundred thirty-two million, four hundred thousand, four hundred forty-three".