221340432 has 40 divisors (see below), whose sum is σ = 573004000. Its totient is φ = 73624320.

The previous prime is 221340409. The next prime is 221340439. The reversal of 221340432 is 234043122.

It is a junction number, because it is equal to n+sod(n) for n = 221340399 and 221340408.

It is not an unprimeable number, because it can be changed into a prime (221340439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19332 + ... + 28572.

It is an arithmetic number, because the mean of its divisors is an integer number (14325100).

Almost surely, 2^221340432 is an apocalyptic number.

It is an amenable number.

221340432 is an abundant number, since it is smaller than the sum of its proper divisors (351663568).

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

221340432 is a wasteful number, since it uses less digits than its factorization.

221340432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9751 (or 9745 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221340432 is about 14877.5143085127. The cubic root of 221340432 is about 604.9046426674.

Adding to 221340432 its reverse (234043122), we get a palindrome (455383554).

The spelling of 221340432 in words is "two hundred twenty-one million, three hundred forty thousand, four hundred thirty-two".